1996 Porsche 911 Carrera Cabriolet

I WORK AT A SMALL REPAIR FACILITY WHO SPECIALIZE IN FOREIGN CARS. I PERFORMED WORK ON MY CUSTOMERS 1996 911 CAB. THE HORN WAS BLOWING ALL THE TIME, MY CUSTOMER REMOVED THE FUSE AND ASKED ME TO CHECK THE PROBLEM. I REMOVED THE AIR BAG AND FOUND THE RUBBER INSULATOR HAD BROKEN AND THE RETAINING FRAME WAS MAKING CONSTANT CONTACT. I REPLACED THE RETAINING FRAME PART# 993 347 08 801 . INSTALLED THE AIRBAG AND REINSERTED THE FUSE. THE HORN IS NOW WORKING. I ALSO CHECK FOR CODES IN THE AIRBAG SYSTEM. FOUND CODE 2 AIRBAG WARNING LIGHT ON , CODE 30 IGNITION CIRCUIT SIDE AIRBAG PASSENGER . I ADVISED THE CUSTOMER AND HE TOOK THE VEHICLE. HE RETURNED A COUPLE HOURS LATER . THE DRIVERS SIDE AIRBAG HAD DEPLOYED ,CAUSING BURNS TO HIS CHEST AND A NEAR CRASH. I CHECKED AND FOUND A RECALL HAD BEEN PERFORMED SOME TIME AGO TO REPLACE THE HORN RELAY FOR THIS CONCERN. NHTSA 98V089001. IT HAS THE CORRECT RELAY IN THE VEHICLE. MY QUESTION IS HAVE THERE BEEN OTHER INCIDENTS OF POST RECALL DEPLOYMENT? THE CUSTOMER IS OF COURSE BLAMING MY SHOP. I HAVE NOT REMOVED THE AIRBAG OR ANY THING ELSE AS I AM REQUESTING HELP FROM PORSCHE IN DETERMINING THE ROOT CAUSE OF DEPLOYMENT. I HAVE NO PROBLEM REPLACING THE AIR BAG AND STEERING WHEEL IF IT IS AN ERROR ON MY PART. BUT DO NOT WANT TO GO THRU THE EXPENSE JUST TO HAVE IT HAPPEN AGAIN IF THE RELAY OR CONTROL MODULE WAS THE CAUSE. I FEEL THIS IS A SAFETY CONCERN AND A DELICATE MATTER BUT FURTHER NEED TO KNOW WHO I SHOULD CONTACT FOR ASSISTANCE. ALSO NO WARNING LABELS ARE ATTACHED ANYWHERE STATING THIS COULD BE A POTENTIAL PROBLEM. ANY REASONABLE PERSON WOULD AGREE THAT AN AIRBAG DEPLOYMENT UNEXPECTED COULD BE FATAL. A REASONABLE PERSON WOULD ALSO AGREE THERE SHOULD BE A WARNING OF SOME SORT ON THE RELAY OR FUSE BOX STATING THIS POTENTIAL HAZARD AS WELL. *TR