Look at the 700/900 FAQ - your switches may be the same. If so, each is keyed in the master switch so that they only go together one way.

If you take the offending switch apart - DON'T LOSE THE SPRING! When I had trouble with my driver's window, I reversed the contact strip as the down contact looked much better than the up contact.

If the contact is not badly burnt, reshape it with emery paper and then fine wet sanding paper, then a burnishing tool - made special to create a hard smooth surface - looks like a worn-out fingernail file. Available at some auto stores or electronics shops.

The shape should be sort of a squashed hemisphere. Look at a good contact.

If the contact is trashed, swap the switch with the switch in the left rear door - you can still open and close this window from the master switch. Cut the plastic key off the corner so that you can install this switch in the master switch. I did this operation on my nephew's 740.