Power Window question-V8

[Richard Romero <raromero@bu.EDU>]

	I recently cleaned the contacts etc. of one of the window 
switches on my V8Q as per the archives- they work great now after 
functioning sporadically.  My ? now is the L rear window has not worked
since I got the car. The switches at the window and at the drivers panel do 
nothing and neither do the lights on these switches. Should I first 
examine both switches or how could I determine if a regulator problem exists?
TIA for any advise.

Andrew Romero