As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ON APU START UP, BLUE MAINT LIGHT ILLUMINATED. NO OTHER DEFECT NOTED ON START. ACFT GROUNDED. CDS REPORTED MTX MESSAGE 49-91227 FOR LOW OIL QTY. COMPLIED WITH FIM TASK 49-90, 804 AND AMM 12-13-31-610-803. NOTED OIL TANK WAS COMPLETLY FULL ON INSPECTION. COMPLIED WITH APU START AND OPERATIONAL IAW 49-11-00, NO FAULTS REPORTED. CDS REPORTS OIL FULL. INTERMITTANT FAULT NO MTX ACTION REQUIRED.