What was found
A-T FAILED TO ENGAGE. A-T MODE NOT DISPLAYED ON ADI. REPLACED EEC (P/N 791100-4-108, S/N 209), NO HELP. ALSO TRIED NEW ADC AND SWAPPED PIMUS, NO HELP. REPLACED AUTO THROTTLE SERVO MOTOR (S253T409-4, S/N 4), NO HELP MR 22324 OFF-4 ON-112. STILL HAVE NO INFC TMC EEC R PRIM AND SEC ON MCDP GRND TEST 30. RECHECKED WIRING FROM TMC TO EEC, CKS OK. TRIED NEW MCP, NO HELP. REPLACED K1040, NO HELP. FOUND OUTPUT BUSS FROM RT PIMU TO TMC INOP ON BOTH CHANNELS. SECURED CONNECTOR D5715P IN BACK OF E2-3 SHELF. ACP'D CAT III TEST. ALL TESTS PASSED. ACFT RETURNED TO CAT III STATUS.