As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
WHEN TOWING TO GATE APU BLUE MAINTENANCE LIGHT ILLUMINATED. GROUNDED - YES. UPON FURTHER INSPECTION DETERMINED BLUE MAINTENANCE LIGHT WAS FOR LOW OIL QUANITY. SERVICED APU OIL TO PROPER LEVEL REF AMM 12-13-31. ACCOMPLISIHED APU OIL LEVEL INSPECTION OIL SIGHT GLASS AND APU BITE PROCEDURE AND BOTH INSPECTION INDICATED FULL OIL NO HISTORY OF BLUE LIGHT ON APU FOR 45 DAYS. ETOPS OILS STARTED APU NO MAINTENANCE LIGHT ILLUMINATED.