Welcome to the forum!
In regards to your steering wheel audio controls, you're probably going to have to order new buttons. I bought my 04 MO from CarMax since they have a guarantee that fixes broken stuff on vehicles for 30 days after it's bought. I found that my steering wheel audio buttons wern't working that well either. When I pushed up/down on the volume button it would work sometimes. Same with the lower audio button as well. They ultimately had to replace the whole button assembly. Entails having to basically take the steering wheel apart to get to them.
In regards to your controller only opening 2 doors, you probably have either loose connections in the lock actuators or bad units inside each door. Have to get that one looked at.
After 142K miles, my MO is history. Now sporting a loaded silver 2012 Ford Edge Limited with 20" wheels.
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