My 03 Chevy 3/4 ton Duramax dully passenger power window doesn't move when pushing either window power buttons. I see in the manual there is both a right and left relay for these windows in a box under the dash. But the plastic box has a keyed locking screw which I have not been able to find a tool to open it. Thought before I remove the door panel I would try to swap the relays in this box to see if they are interchangeable and if they may fix things.
Any thoughts on this.

 

It's not a bad idea. But typically it's the motor if both switches fail.