As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
APU BLUE MAINTENANCE LIGHT ILLUMINATED AFTER APU START. ACFT GROUNDED. PERFORMED APU BITE AND FOUND MAINTENANCE MESSAGE 49-91227 FOR LOW OIL LOGGED. CHECKED APU OIL AND FOUND FULL. PERFORMED LOW OIL QTY FAULT ISOLATION IAW FIM 49-90, TASK 804. APU FAULT CLEARED. RAN APU, OPS CHECKED GOOD. NO CURRENT FAULTS IAW FIM 49-60/801.