What was found
FLT#1524, LAX-JFK. (ETOPS) FUEL IMBALANCE OF 100 #'S LT WING TANK @ 11000 #'S RT WING TANK @ 12500 #'S. FUEL IMBALANCE BEGINS WITH 13000'S OF FUEL IN EACH WING TANK AND NO FUEL IN THE CENTER TANK. CTR TK R XFR REMAINED ON. EVEN THOUGH FUEL BURNED THROUGHOUT THE FLIGHT, NO FUEL LEAKS WERE NOTICED. APU FUEL PUMP CANISTER -TEE WAS REMOVED AND REPLACED PER AMM A 321 28-22-52, LEAK CHECK WAS GOOD