Unexpectedly acquired an 86 190e about a week ago. Trying to troubleshoot the power window circuit which controls the driver front and pass rear windows.

So far:

Fuse is good
Switches swapped over and work in the opposite circuit

Where to next?
I've found a thread suggesting the relay behind the cluster, but this problem pertains to just the driver window circuit (#7 fuse I think).
Wouldn't I lose all 4 windows if the relay was bad?

Any help appreciated.
Thanks-