What was found
DURING APU START, MAINTENANCE LIGHT ILLUMINATED, AFTER SHUTDOWN, FAULT LIGHT ILLUMINATED. ACFT GROUNDED. PERFORMED BITE CHECK APU CDU, FOUND FAULT CODE 49-41244 LOGGED, START CONVERTER SHOWS FAILED GENERATOR DIODE-FAULT ISOLATION. PERFORMED FIM TASK 49-40-806. APU FAILED TO START. FOUND APU OIL FILTER INDICATOR EXTENDED. ACCOMPLISHED APU OIL FILTER INDICATOR INSPECTION AND SERVICING IAW MM TASK 49-91-13-200-801 AND 49-91-13-600-801. FOUND FAULT 49-41244. REPLACED APU START CONVERTER UNIT IAW AMM 49-41-61. PERFORMED FIM TASK 49-41244 TO CLEAR CURRENT STATUS FAULT PRIOR TO APU START. APU OPS AND LEACK CHECK GOOD IAW AMM 49-11-00. PERFORMED 4 APU STARTS, APU NOW SHOWS NO FAULTS ON CDU IAW TASK 49-60 801. LEAK CHECK GOOD FOR APU STARTER/GENERATOR AND APU OIL FILTER IAW AMM 49-11-00.