Seat problem 2005 Yukon XL Denali

We just picked up a 2005 Yukon XL Denali last week, owners manual is on order. The driver seat won't operate electrically, to go forwards/back or up down, the passenger seat controls work. Is there a "lock" for this, maybe on the driver door buttons, that is preventing this from working? The seat did work, even on the automatic movement to let driver exit, just last week. I'm afraid we pushed one of the 500 buttons by mistake, and "locked" its operation. It has some type of Driver1 and Driver2 thing. Thanks.

There IS power to the lumbar button on that seat, can hear a motor actuate.

Got this fixed, previous owner had some issues with this as well, as the bottom cover was off. I removed the five screws holding the switch panel on. The electrical part of the switch was off, that could snap back into place. It turns out that the electrical part was OK, but the mechanical "switch" part was jammed for the vertical seat-angle switch. I called dealer, they needed VIN number to look up. Anyway, the hardware part with just the switches is not available separately, and whole assembly is about $170 special order. So I cut out the black part of the mechanical part of the switch, so one could stick a finger in and slide that switch to activate if desired. The front horizontal switch is fine. So I buttoned it all up works fine, don't need to try to find replacement switch at wrecking yard either now.

Oh, yes. The passenger seat is broken the same way - couldn't be a GM design flaw, could it? Is there a TSB?