In the first of many posts about my newly acquired '87 Westfalia, the
passenger's side window motor/winder ass'y is not working. The window
gets stuck at various positions, and the motor only intermittently
operates when the switch is depressed.

Can anyone tell me what is the most likely failure in this system? I
know the motor and winder are an integral unit (according to R.
Bentley), but how much do these cost?

Thanks..

...Dan