What was found
MDIS 687 36-10 3306 31JUL21 MEM OPEN U FWD GROUND PNUMATIC SUPPLY PORT CHECK VALVE LEAKS AFTER ENGINE AIRSTART COMPLETED. SHGN 31JUL21 23:40 MEM U INSPECTED FWD GROUND PNUMATIC AIR SUPPLY CHECK VALVE. FOUND SPRING THAT NORMALLY CLOSES THE CHECK VALVE BROKEN AND HOLDING THE CHECK VALVE PARTIALLY OPEN. WILL HAVE TO BE REPLACED. PART 31JUL21 23:48 MEM U IDENTIFIED PARTS NIPPLE CHECK VALVE MPN: 4663-1 CPN: 3610205 QTY: 1 PART 31JUL21 23:48 MEM U ORDER PART MPN: 4663-1 CPN: 3610205 QTY: 1 ICT: 103105 PART 01AUG21 03:47 MEM U IDENTIFIED PARTS SEAL MPN: A2113221220400 CPN: 3612248 QTY: 1 PART 01AUG21 03:47 MEM U ORDER PART MPN: A2113221220400 CPN: 3612248 QTY: 1 MSN: 2067859 SHGN 01AUG21 04:48 MEM U REMOVED CHECK VALVE ASSY. FOUND BAD SEAL. NO SEAL ON HAND, ORDERED SEAL. OLD PARTS, HARD WARE AND NEW CHECK VALVE PLACED ON BOARD. REF A300 AMM 36-13-11-04 REMOVED AND REPLACED FWD HP GROUND CONNECTOR AND SEAL REF AMM 36-13-11-04. OPS CHECK REQUIRED.