2009 Chevrolet Express 1500

I'M FROM AN INDEPENDENT REPAIR SHOP. I HAVE RECENTLY HAD PROBLEMS WITH THIS 2009 EXPRESS VAN. IT HAS FOR NO REASON THAT I CAN TELL. DEPLOYED THE SIDE AIR BAGS WHILE BACKING THE VEHICLE UP A DRIVEWAY @ LESS THAN 5 MPH. TO GIVE YOU A LITTLE HISTORY ABOUT THE VEHICLE. THE CUSTOMER PURCHASED THE VEHICLE FROM A USED CAR DEALER APPROXIMATELY 6 MONTH AGO. THE FIRST PROBLEM WITH THE VEHICLE WAS WITH THE STABI-TRAC & REDUCED POWER LIGHT CAME ON . WE HOOKED UP ARE TECH-2 SCAN TOOL AN RETRIEVED THE CODES AN DIAGNOSED THE PROBLEM WITH THE STEERING WHEEL POSITION SENSOR AND THE THROTTLE POSITION SENSOR. WE REPAIR THOSE ISSUES AND SENT IT ON. A LITTLE OVER A MONTH LATTER THE CUSTOMER WAS DRIVING THE VEHICLE DOWN A PAVED ROAD @ 50- 55 MPH ON A NEAR STRAIGHT AWAY. AND IT DEPLOYED THE SIDE AIR BAGS & SEAT BELT PRETENSIONERS . THE CUSTOMER GOT IT REPAIRED AT A BODY SHOP WHICH REPLACED SIDE AIR BAGS, SEAT BELT PRETENSIONERS, SIDE IMPACT SENSORS & AIR BAG MODULE. NOW ROUGHLY A WEEK LATER IT DEPLOYED THE SIDE AIRBAGS AGAIN WHILE BACKING UP A DRIVEWAY IN REVERSE TO PICKUP HIS WIFE. I HAVE THE VEHICLE NOW AND RETRIEVED THE CODES ( B0052/ B0023 / B0022 / B0016 / B015 / B0090-71 ) DOES GM HAVE PROBLEMS WITH THIS TYPE OF VEHICLE? AND I'M WONDERING CAN A ROLLOVER SENSOR MALFUNCTION AN CAUSE THIS TO HAPPEN. GOING BY THE CODE B0090 I HAVE REMOVED THE CARPET ON THE VEHICLE AND FOUND MOISTURE UNDER THE CARPET NEXT TO THE ROLLOVER SENSOR. I REMOVED IT AND FOUND NO CORROSION AT THE WIRING OR CONNECTOR. AND THE MODULES IS A SEALED MODULE. CAN ANYBODY PULL THE CRASH DATA OUT OF THE AIRBAG MODULE SO I CAN TELL WHAT PARTS ARE ALL NEED TO BE REPLACED. ANY INCITE WOULD BE APPRECIATED. THANKS IN ADVANCE. *TR