As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
BLUE APU "MAINT" IS ILLUMINATED. VERIFIED OIL LEVEL ON APU SIGHT GLASS AND CDU SHOW FULL. PERF APU BITE PROCEDURE PER FIM TASK 49 60 00 810 801 NO FAULTS. TECH SERVICES REQ T/S OF APU OIL QUANTITY INDICATION ERRORS. COMPLETED STEPS OF FIM 49 90 00 810 804 NO FAULTS. REPLACED APU ECU REF AMM 49 61 12 BITE CHECK GOOD REF AMM 49 61 00.