What was found
P/N MS24678-13C - SCREWS FOUND WITH HEAD BROKEN OFF, LOCKWIRE STILL ATTACHED TO SCREW HEAD DURING ACFT INSP ON HYD PUMP. HYD PUMP HAS 2 SCREWS OF THIS P/N WHICH RETAIN PORT CAP AND 2 SCREWS WITH DIFFERENT P/N. THE 2 DIFFERENT P/N SCREWS WERE THE ONLY ONES RETAINING PORT CAP ON THE PUMP, BOTH 2 EACH MS28678-13C HEADS FAILED. 2 FAILED SCREWS TESTED, SEVERE HYDROGEN EMBRITTLEMENT. HYD PUMP O/H 6-23-99, INSTALLED 8-12-99, REMOVED 12-10-99, TSO 260.7 HRS. 2 FAILED SCREWS REPLACED AT O/H WITH NEW, TRACEABLE BY LOT 000062775 MFG 99660-1. ON SIDE OF SCREW HEAD, MFG IDENTIFIED WITH ''CBS''. HYD PUMP WITH FAILED SCREWS REPLACED WITH NEW, RETURNED TO SERVICE. FAILED SCREWS, LOT 000062775, CUSTOMERS TO BE NOTIFIE