What was found
TANK WORN FROM INTERIOR UPHOLSTERY PANEL VIBRATING AGAINST WELD. COULD BE CATASTROPHIC, DUMPING 14 GALS FUEL INTO CABIN AND AFT FUSELAGE. SUBMITTER STATED HAVE FOUND THIS IN NUMEROUS LUSCOMBES WITH FUS TANKS. RECOMMEND INSPECTING FOR DAMAGE TO EDGE WELD. IF STILL AIRWORTHY PUT FELT SPACERS ON PANEL TO KEEP PANEL AWAY FROM TANK. OTHERWISE, PURGE TANK AND RE-WELD OR REPLACE WITH AIRWORTHY TANK.