I own a 1992 GXE. Just over the last few days, my power door locks have been going crazy. I arm the factory security system, and a few hours later when i return to my car, its completely unlocked (however still armed). The driver's master door lock button doesn't always work, and is working less daily, and the buttons on each door fight to go down, popping back up repeatedly. Even when driving down the street with the doors locked, they just seem to pop up like there is a ghost in the car. Every once in a while, I hear a sound like a motor turning behind the steering wheel while also driving. My best diagnosis is that there is a motor back there controlling the locks and its failing?

Can anyone give me assistance on the matter? Problem diagnosis? or where I can get parts perhaps?

Thanks,
Jim