All locks on the car have always worked nicely but awhile ago I noticed they started to become sluggish and then for awhile they'd all work (sluggishly) with the exception of the back passengers door which I would I have to walk around the car and lock manually. Is this perhaps a tip off or could it serve as a reference for a starting point for repair? None of the power locks work now and well you know not too good for dating!
Any help, tips, ideas or suggestions appreciated.
1989 300 SE