As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
MAINTENANCE LIGHT ILLUMINATED DURING APU START, ON THE GROUND. ACFT GROUNDED. REMOVED AND REPLACED APU STARTER GENERATOR IAW AMM 49-41-21. WHILE PERFORMING OPS CHECK FOUND AFTER CLEARING PREVIOUS FAULT, APU WOULD NOT START. FAULT LIGHT CAME ON AND FAULT CODE 49-41244 APPEARED DURING BITE TEST. PERFORMED FIM 49-40 TASK 806 UP TO STEP F. PERFORMED FIM 49-40 TASK 806. STARTED APU NORMALLY.