What was found
MBJ - DURING CRUISE HYDRAULIC SYSTEM A QUANTITY LOST, AFTER LANDING QUANTITY AT 7 PERCENT QUANTITY DURING CRUISE VARIED FROM % 12 - % 20. HYDRAULIC PUMPS NEVER DISPLAYED LESS THAN NORMAL PRESSURE WHEN SWITCHED ON. OPS CHECK PROBE LEAK AT ACOUSTIC FILTER LOWER FITTING. O-RING FITTING REMOVED TO FACILITATE O-RING (P/N NAS1612-8A) CHANGE REPLACE FITTING AND RESERVICE HYDRAULIC RESERVOIR SYSTEM. SYSTEM GROUND CHECK NORMAL OPERATION.