Hatchback/liftgate Hinge problems of the 2006 Chevrolet Suburban

I have a 2006 chevy Suburban z71 with just over 95,500 miles. The rear hatchback/liftgate locking mechanism appears to have failed. The vehicle was not in an accident, and no other event ocurred. The lock simply quit working. Neither the door nor the glass will unlock. There is no manual way to unlock or open the rear door when the power locks are not working. There is not an emergency release to pop the rear door or glass in case of emergency. All other doors on the vehicle are still functional manually and electronically. No fuses have failed. I have not been notified of a recall and have not followed up with the dealership or a mechanic yet. In 2006/2007 we also experienced an odd electrical problem that the dealership could not reproduce. The vehicle would have an obvious electrical odor/burning smell and various lighting failures after being in heavy snow on three separate occassions. The problem was logged but never occurred again.