What was found
APU AUTO SHUTDOWN WITH FAULT LIGHT ON ATTEMPTED ONE RESTART WHICH FAILED. FOUND UNDERSPEED AND MINI FLAGS 42 AND 66 ON APU BITE. FOUND NO LIGHT OFF ON SUBSEQUENT APU START TRIES ON APU BITE. REPLACED APU IGNITOR PLUG PER AMM 49-41-02. REPLACED APU IGNITION LEAD PER AMM 49-41-04. REPLACED APU EXCITOR BOX PER AMM 49-41-03. REPLACED INLET GUIDE VANE ACTUATOR PER AMM 49-52-02. INSTALLED FUEL INLET AND RETURN LINES. APU CHANGE REQUIRED. REMOVED AND REPLACED APU ASSY PER HAL-M266-767. OPS AND LEAK CHECK GOOD. OK FOR SERVICE.