What was found
HYDRAULIC PRESSURE INDICATION ZERO SYSTEM A HYD SYS A LOSS LOCKED FOR COMPLIANCE UNLOCK. VERBAL FROM CREW. HYD QTY GOT DOWN TO 10% IN FLIGHT (READS 31 ON GROUND NOW). PRESSURE REMAINED AT 2950 WHILE PUMPS WERE ON. PUMPS OFF. NW STEERING TO ALT. RUDDER SWITCH TO STBY. GEAR DROPPED WITH MANUAL EXTENSION. LEFT T/R OPERATED NORMAL. FOUND A SYS PRESSURE TRANSDUCER LEAKING AT ADAPTER. REF IPC 29-11-71-01. REQUIRES O-RING ITEM 45. P/N NAS1612-8. REMOVED AND REPLACED PRESSURE TRANSDUCER REF AMM 29-11-71. OPS AND LEAK CHECK GOOD.