04 Silverado 1500 Ls Crew Cab Power Window Inop

[Under PSI]

The left rear power window will not operate up with the driver master switch. It will go down with the master and will go up and down with the left rear switch. I don't even hear a click from the left rear door switch when operating it up from the master like I do on all the others. I have removed the master switch and tried to clean the contacts on the switch and this has had no effect on the problem. This vehicle has multiplex control units to operate the power windows right? Is there any way to test the master switch and communication lines? Any one have a factory wiring diagram? Thanks Jeremy

[Under PSI]

never mind. I traded in the truck