As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
BLUE MAINTENANCE LIGHT ON APU. ACFT GROUNDED. ACCOMPLISHED BITE CHECK WITH MAINTENANCE LIGHT ON, MESSAGE LOW OIL QTY. SHUTDOWN APU. CHECK OIL QTY AT TANK, OIL TANK FULL. RESTARTED APU, MAINTENANCE LIGHT IS OUT AND BITE CHECK SHOWS OIL QTY FULL.