What was found
NR 2 ENGINE HAS HISTORY OF HPTACCV ECONOMIC FAULT MESSAGES 75-30412, 75-20412, 75-10362, 75-10412. PREVIOUS MAINTENANCE EEC AND HPTACCV HAVE BEEN REPLACED AND FAULTS CONTINUE. TECH SERVICE REQUESTS FOLLOW-UP. ACFT GROUNDED. REPLACED J9 & J10 HARNESS REF MM 73-21-06-000-802-F00. FOUND BAD THREAD ON B, CHANNEL RECEPTACLE OF T25 SENSOR. REMOVED, REPLACED, AND TESTED NR 2 ENGINE PT25 SENSOR REF MM 73-21-02-000/400-801-F00 & 71-00-00-800-811-F00, TABLE 502. ACCOMPLISHED NR 2 ENGINE EEC DISCRETE TEST & ACTUATOR TESTS IAW AMM 73-21-00-700-809-F00 AND 71-00-00-700-807-F00.