What was found
ETOPS SIGNIFICANT SYS - ON OVERNIGHT CHECK FOUND R PIMU MESSAGE ON ECS MSG PAGE EICAS. TROUBLESHOT IAW FAULT ISOLATION MANUAL CH 71. PIMU INDEX BITE OF PIMU REVEALS EEC CHA FAULT, CAT 2 EEC CH A,TCC FD-BK FAIL. EEC CH B FAULT CAT 2 AND EEC CH B BTCC FD-BK FAIL MESSAGES, FAULT NR 351-27. PERFORMED TS IAW FIM CLEANED AND INSPECTED CONNECTOR D90029 ON HARNESS W4P16 ON TCC VALVE M3107, OK FOR SVC.