What was found
NR 2 ENGINE HAS A SHORT TERM FAULT, FAULT 75-20572 (HMU, TBV SIGNAL OUT OF RANGE ). FAULT IS CURRENT. FOUND WHILE PERFORMING T/C 78273000. ACFT GROUNDED. REMOVED EEC FROM NR 2 ENGINE REF AMM 73-21-60-000-801-F00. INSTALLED EEC ON NR 2 ENGINE, REF AMM 73-21-60-400-801-F00. PERFORMED FADEC SYS TEST AMM 73-21-00-700-802-F00. PERFORMED EEC TEST IAW AMM 73-21-00-700-804-F00, TEST PASSED. PERFORMED IDENT/CONFIG TEST IAW AMM 73-21-00-700-808-F00, TEST PASSED. PERFORMED TEST 12- ACTUATORS TEST IAW AMM 71-00-00-700-807-F00, TEST PASSED. PERFORMED EEC DISCRETES TEST IAW AMM 73-21-00-700-809-F00, TEST PASSED. NO FAULTS FOUND.