As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FAULT LIGHT ILLUMINATED ON APU START. ACCOMPLISHED FIM 49-90-00-810-809. REMOVED AND INSPECTED STARTER GENERATOR FILTER, NO DEBRIS FOUND. INSTALLED NEW FILTER ELEMENT FOR STARTER GENERATOR IAW MM 49-91-12-400-803. CONTINUED FIM, R & R OIL FILTER INDICATOR. RAN APU, NO FAULT LIGHT ILLUMINATED, PERFORMED APU BITE CHECK NO CURRENT FAULTS EXIST.