The seat release is hung up, which happens from lack of use. I had a '94 and the release, if I remember correctly, was at the rear of the rt. rear door and operated by opening the door. On your model, I believe it is mechanical as previously posted. Try lubing it and a lot of jiggling and shaking.

The door locks sound like a vacuum leak/s in the system.

a great car, keep them serviced.

Ed

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Ed
1960 220 SE Coupe (Ponton)
1999 E320 Wagon
2007 E350