What was found
TPE/ANC AFTER 5HRS FLIGHT CAC FAN 2 C/B POPPED. AFTER LANDING AND ENGINE SHUTDOWN IN ANC CAC FAN 1 C/B POPPED. AFTER 7HRS 20MIN LEVEL 1 ALERT "AC TIE 1 OFF" APPEARED. CORRETIVE ACTION: UPON INITIAL INSPECTION FOUND AC BUS TIE RELAY OVERHEATED THE BUNDLE AND CAUSED A DIRECT SHORT CIRCUIT THAT TRIPPED THE C.A.C FAN BREAKERS AND BURNED THE WIRE BUNDLE. REMOVED & REPLACED DAMAGED WIRING IAW MM 20-10-01 & MM 24-97-00. REMOVED & REPLACED EPCU, ESC AND NR 1 & 2 CAC FANS OPS CHECK OK. NO AC TIE 1 OFF ALERT DISPLAYED AFTER POWER UP. RTS ALL TESTS PASSED.