What was found
(CAN) DURING PUSH-BACK FROM THE GATE WITH BOTH ENGINES RUNNING (PROPS FEATHERED), THE NR 2 ENGINE HAD AN UN-COMMANDED SHUTDOWN WITH AN ASSOCIATED NR 2 ENG FADEC FAIL WARNING LIGHT AND POWERPLANT MSG. INTERROGATION OF THE CDS REVEALED THE FOLLOWING FAULT CODES: 705, 707, 734, MPT, 737, 740, 748 & 749. FIM TASKS ARE CURRENTLY IN WORK, BUT AS FAULT CODES 705 & 707 ARE INDICATING AN INTERNAL FAULT IN THE FADEC. FADEC REPLACED IAW AMM TASK 73-21-01-400-801, FAULT CODES CLEARED, PLA TRIM AND ENGINE RUNS CARRIED OUT SUCCESSFULLY.