RE: speakers work?
Take the grille off and push lightly on the larger speaker cone, it should move in and out smoothly. If it is stuck or makes noise as it moves the speaker is blown. Also the soft part around the edge needs to be intact, they fall apart with age. Compare to the known good one in the other door if you have to.
The wiring to the door can fail too, it might make a crackling sound sometimes.
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