What was found
C1 ADP NOISY-VIBRATING, AND IS LEAKING OIL. ALL OTHER REQUIRED SYS OPERATE NORMAL. PUMP SWITCH SELECTED OFF. NO ASSOCIATED EICAS. PUMP C1 IS CONSIDERED INOP. REPLACED C1 AIR-DRIVEN PUMP ASSY. PROBLEM STILL EXISTS. NEW PUMP INOP, MX MSG 29 -11020. ONCE REPAIRED PUMP WILL NEED LEAK CHECKED. IF NEEDED REFER TO IPC FOR ISOLATORS. INSPECTED INSULATORS, APPEAR TO LOOK OK. REACTIVATED IAW MEL. LEAK CHECKED PUMP, OPS CHECK GOOD.