2009 AUDI Q5 Engine Problems

ON 7/02/09 MY AUDI Q5 (VIN# [XXX]) WAS PURCHASED FROM, AND SERVICED BY BARRIER AUDI BELLEVUE, WASHINGTON; NOW DOING BUSINESS AS AUDI BELLEVUE A DEALERSHIP OWNED AND OPERATED BY AUTO NATION. TECHNICAL SERVICE BULLETINS [TSB] WERE SENT TO SOME AUDI OWNERS ON 12/6/2013 CONCERNING REPAIR AND CLEANING OF THE SECONDARY AIR CONTROL VALVE WITH A WARRANTY EXTENDING THROUGH 07/02/2019. THIS PROBLEM WAS INITIALLY CORRECTED ON 12/27/2013 @44,445 MILES, MY LAST SERVICE WITH BARRIER WAS 09/13/2018 AND AT NO TIME HAD I RECEIVED NOTICE THAT THE PROBLEM COULD RESURFACE. THE TSB PROVIDES : "THE SECONDARY AIR SYSTEM ON THESE VEHICLES IS USED TO HEAT UP THE CATALYTIC CONVERTERS QUICKLY DURING COLD-START CONDITIONS?. OVER TIME, AND DEPENDING ON DRIVING STYLES, CARBON WILL BUILD UP IN THESE SMALL 10MM PORTS AND CAUSE FAULTS IN THE ENGINE CONTROL MODULE FOR SECONDARY AIR, BANK1/BANK2 INSUFFICIENT FLOW? SOME MODELS DO HAVE A WARRANTY EXTENSION, WHICH COVERS...

VEHICLE HAS BEEN WELL MAINTAINED AND SERVICED ON SCHEDULE AT THE DEALERSHIP. THERE WERE NO WARNING LIGHTS OR INDICATIONS ON THE DASHBOARD PRIOR TO THE INCIDENT. AFTER THE CAR SAT IDLE ALL NIGHT, ON THE MORNING THE NEXT DAY, I TRIED TO TO START TO CAR. THERE WAS BIG POP SOUND. TURNED OFF THE ENGINE AND RESTARTED AFTER A COUPLE OF MINS AND NOTICED, MESSAGE ON THE DASHBOARD INDICATING ALTERNATOR FAULT. OPENED THE HOOD AND NOTICED THE SERPENTINE BELT HAS COMPLETELY FALLEN OFF. THIS RESULTED IN THE POWER STEERING BEING COMPLETELY DISABLED. BATTERY STOPPED CHARGING. VERY VERY LUCK THAT THIS INCIDENT HAPPENED WHEN THE CAR WAS IDLE. THE CAR WAS IMPOSSIBLE TO DRIVE AS THE STEERING WAS EXTREMELY DIFFICULT TO TURN. SECONDLY THE BATTERY STOPPED CHARGING. THE DEALERSHIP SERVICE HAS NO ANSWER AS TO WHAT CAUSES THIS. ESPECIALLY WHEN THE CAR HAS BEEN THROUGH SERVICE JUST A FEW MONTHS AGO....