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Change the 12 vdc battery. You needn't have replaced the brakes.

These transmissions had a problem with leaks where the two halves of the case met. Are you sure it's not there? Also, transmission oil does not need to be changed in this car. The manual says 100,000 miles for "automatic transmissions". This is not an automatic transmission. It's an eCVT which has no clutches, belts, bands, torque converter, shift solenoids or anything else to wear. It's only gears rolling on gears and should last a lifetime. It's suspicious that the leak happened after the oil change.

Are you sure you have successfully changed the HVB age?

Change the 12 vdc battery. That's the default action to take with multiple unconnected faults. It doesn't matter if the battery tests ok. The 2013+ FFHs had a problem with a bad bearing, It was not a transmission fluid pump. A recall should have been made but because it wasn't a safety issue Ford just waited out the warranty expirations. The transmissions are covered by the hybrid warranty for 8Y/100k m. or 10/150k m in CARB states. Are you under that warranty? Prior to 2013, Aisin, the Borg Warner of Japan made all of Ford's hybrid transmission. They were bullet proof. For 2013 Ford brought the manufacture in house and screwed it up. It looks identical to the Aisin but there were many bearing failures and also case seal leaks. I hope you don't have a problem with the replacement transmission digitally "hand-shaking" with the car. This is not a backyard mechanic project. Good luck.

Great job. Don't do any other maintenance unless the car needs it. Common high mileage problems are stuck throttle body and O2 sensors.

The throttle body may have carbon-ed up and stuck. They can be cleaned but for $70 it's easier to replace them. My car went to my grandson 3 years ago and was rear ended and totaled last spring with no injuries. My Tesla Model 3 is 3 1/2 years old. Go EV now with a Tesla. If it's too expensive, work harder or sell the house and live in the car. It's the "Revolutionary Future, Today".

You don't need to balance the HVB manually, the car does it automatically periodically. You can tell when it's doing this by the EV mode being inhibited for about 20 minutes, the ICE running continuously and the HVB charging to max. When it's finished it reverts to normal operation. If you go into reverse during this procedure it is cancelled and will probably do it over. Most who have done the software update say re-balancing occurs sometime after.

It sounds like you're still out of alignment. Lights for power steering ABS and Traction are not "typical. A weal 12 vdc battery can cause lots of strange problems. If it's more than a few years old change it no matter how it tests. You may also have a steering system problem.

Nobody has reported a problem.

The theory behind hybrids is to only run the ICE when there is significant demand. Acceleration, higher speed, Cat converter warm up, cabin warm up, hills, etc. At about 30 mph on level roads it will go about 1/2 mile in EV and then about 1/2 mile on ICE.

46 mph is the max EV speed. 50% is normal HVB charge level. Do not force EV mode, use ICE to accelerate. There are 8 different normal conditions that cause the ICE to run. About every 10k miles the ICE may run for about 20 minutes and charge the HVB to F. That's re conditioning.

The transmission is included in the 8 year, 100/150 k mile hybrid warranty.

The 150K change is for "automatic" transmissions. The FFH has an eCVT which is not an "automatic". There is hardly anything to wear in an eCVT. There are no belts, clutches, bands, valves or torque converters. Only gears rolling on gears.

If the high voltage battery (HVB) is completely discharged, only a Ford dealer can recharge it with special equipment that usually must be shipped to them. If the 12 vdc battery is discharged, replacing or recharging it may enable the car to start as Vonore stated.

There was a "Customer Satisfaction" software update 11 years ago 10 B 13 that may not have been done on your car. Check that first. It's a 15 minute job and if it was done there will be a record of it at Ford. Also you have other warnings there also. Replacing the 12 vdc battery will frequently fix them. There is also an electric vacuum pump that makes a lot of noise as it ages that has been a problem on Fords. Checking diagnostic codes DTCs should pinpoint the problem. Do not replace all the brake system components.