2006 GMC Denali XL Fuses / circuit breakers keep blowing that control the passenger side front and rear windows as well as the passenger side seat. The dealer has been looking for 2 days and can't find cause. Any ideas or suggestions on what could be causing this (that I can share with the tech at the dealership)?

Anytime you have an incident like you describe, you have a ground fault(short) somewhere. Normal procedure is to disconnect everything connected to the relay or fuse and then start connecting up again. When it blows you have found the problem. Wiring issues are most difficult to diagnose since the problem is many times covered with plastic "smurf" tubing or taped. In seats and windows, the wires have to move and may catch on seat tracks and door frames, resulting if the short.