What was found
APU FAULT. 3 START ATTEMPTS FAILED. PERFORMED TROUBLESHOOTING IAW FIM TASK 49-11-00, FIG 105. FOUND APU BATTERY LOW VOLTAGE START, CHARGER OK. REMOVED AND REPLACED APU BATTERY IAW AMM 24-31-04, ALSO CHANGED APU IGNITER PLUG AND IGNITION CABLE PER AMM 49-41-02 AND AMM 49-41-04. APU STARTED GOOD, TRIED TO DRY MOTOR NR 2 ENGINE, LOST APU BLEED AIR DURING START, WOULD NOT RESET BLEED AIR. SHUT DOWN APU, TRIED TWICE NO START, START 3RD TIME APU START OK. DUE TO APU FAULTS, APU NEEDS CHANGE. STARTED TO REMOVE APU. REMOVED APU MR49112 S/N 61758. REPLACED APU & BATTERY.