What was found
DURING POST-FLIGHT INSPECTION, A BUBBLE WAS FOUND ON THE SIDEWALL OF TIRE. AFTER TIRE WAS REPLACED, THE S/N WAS CHECKED AGAINST ANOTHER TIRE THAT HAD BEEN REMOVED PREMATURELY FOR AIR LEAKING FROM WEEP HOLES IN SIDEWALL. THAT TIRE S/N WAS 7102030. SINCED THESE 2 TIRES WERE PURCHASED IN A LOT OF 3, THE THIRD TIRE, SN 71020929, WAS RESEARCHED. THIS TIRE HAD ALSO BEEN REMOVED FROM SERVICE PREMATURELY BECAUSE IT HAD BEEN FOUND ON A POST-FLIGHT WITH VERY LOW PRESSURE. A VISIBLE PUNCTURE HOLE HAD BEEN PRESUMED TO BE AT FAULT, THOUGH THE TIRE WAS NOT TOTALLY FLAT. SUBMITTER STATED IT APPEARS SOME SORT OF MANUFACTURING DEFECT IN THAT S/N BATCH CAUSED ALL 3 DEFECTS. 69 LANDINGS SINCE NEW.