As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AFTER ENGINE START CREW NOTICED "MAINT" LIGHT ON WENT OUT MOMENTARILY THEN CAME BACK ON. ACFT GROUNDED. CDU SAID "ADD OIL". WENT TO SERVICE WITH OIL AND FOUND OIL IS FULL. SERVICED APU OIL IAW AMM 12-13-31. OPERATED APU FOR 2.5 HRS. NO MAINT LIGHT.