It's really not that hard to pull the panel - it takes me 10 minutes maybe (remember to lift up...). I would pull it off and disconnect the wires at the motor, turn KOEO, connect your multimeter to the wires, try the switch and see if you have power.

If you have 12v there, the problem is in the motor...

ryan

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RG Newell

1984 300D
1972 250
1986 560SL
1991 300CE