As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
APU MAINT LIGHT CAME ON AFTER START. ACFT GROUNDED. PERFORMED APU BITE PROCEDURE FOUND "MAINT LIGHT FOR LOQ ON" ACCOMPLISHED LOW OIL QTY BITE DEACTIVATION PROCEDURE. "MAINT LIGHT FOR LOQ OFF" SHOWS ON CDU. REF AMM 49-61-00, APU OPERATIONAL.