What was found
DURING CRUISE, A LOUD NOISE WAS HEARD IN CABIN. RETURNED TO ATL. THE RIGHT GEAR NR 3 TIRE HAD THE RETREAD BLOW OFF. DAMAGE OCCURED TO APU EXHAUST DUCT, GEAR DOOR RELEASE BRACKETS, L/E OF NR 3 PYLON AND RIGHT INBD AFT FLAP. WHEN WHEEL ASSEMBLY WAS CHANGED IT WAS NOTICED THAT ONLY THE RETREAD HAD SEPARATED AND THE TIRE STILL MAINTAINED PRESSURE. FOR RETURN TO SERVICE REPLACED NR 3 AND 4 WHEEL ASSEMBLIES, APU EXHAUST DUCT, L/G DOOR BRACKERS, PYLON L/E AND AFT FLAP.