What was found
APU COLD SOAKED START ATTEMPT FAILED AT 360 APU FAULT LIGHT APPEARED. GROUNDED - YES. ACCOMPLISHED APU BITE PROCEDURE REF FIM 49-60 TASK 801, LOGGED FAULT 49-31016 OVER TEMPERATURE SHUTDOWN. ACCOMPLISHED FIM 49-30 TASK 803 OVER TEMPERATURE SHUTDOWN- FAULT ISOLATION. PER STEP H1, REPLACED FUEL CONTROL UNIT PER AMM TASK 49-31-11-400-801. PERFORMED APU OPERATIONAL CHECK PER AMM TASK 49-11-00-860-801. OPS CHECK GOOD AND LEAK CHECK GOOD. PERFORMED APU BITE PROCEDURE PER AMM TASK 49-61-00-700-801. NO CURRENT FAULTS LOGGED. SIGNIFICANT SYSTEM GROUND VERIFICATION SUCCESSFUL.