What was found
FURTHER EVALUATION OF APU COLD SOAKED START WITH FAULT IAW ENGINEERING REQUEST, PERFORMED APU BITE IAW AMM 49-61-00. ONE FAULT FOUND. STARTS OLD FAULT 49-31016 OVERTEMP SHUTDOWN. ACFT GROUNDED. PERFORMED FIM 49-30, TASK 803, STEP B 1-3. LOOKED FOR BLOCKAGE IN INLET, NO BLOCKAGE FOUND. CHECKED MAG DRAIN PLUG, NO PARTICLES FOUND. NO ROTATION PROBLEM AS NOTED. FIM 49-30 TASK 803, STEP B-4 IS FCU. REMOVED AND REPLACED APU FCU, IAW AMM 49-31-11. NO LEAKS NOTED. REMOVED AND REPLACED THE APU LUBE MODULE IAW AMM 49-91-11. NO LEAKS NOTED. PERFORMED BITE CHECK, NO FAULTS FOUND.