As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AT APU START ATTEMPT ON TAXI INTO GATE THE APU AMBER MAINT OVERHEAD LIGHTS ILLUMINATED. GROUNDED - YES. REMOVED AND REPLACED APU STARTER-GENERATOR IAW B737-9 AMM 49-41-21. PERFORMED B747-9 IFIM 49-40-00-810-806 "APU "LIMITED RESET" FUNCTION, OMF SHOWED "NOT ACTIVE" FOR APU FAULTS. RAN APU MULTIPLE TIMES WITH NO FAULTS. ORIG SUBMISSION DATE: 12/22/2022