Window problem - 89 200TQ

[bjm]

Hi,
Sorry if this is an FAQ, but my right side window (motor driven), goes 
down easily, but then most times, it wont go back up, using either of 
the switches on the driver or passenger side. If you select down then 
very quickly rock the switch to up, then sometimes it goes up again 
(only way I have found so far).
Once it starts moving back up it works fine till its fully closed.
I have left it closed most days for the last few weeks.

This is the first window problem I have had since I got it in 1993, so I 
am probably lucky !
Where do I look first to fix this problem esp since winter will be on us 
soon here in CO (relative to the speed I fix things) ?

thanks
Barry McInnes 1989 200TQ SJM Chip 110K