As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
APU HAS HISTORY OF MUILTIPLE FAILED CSS WITH FAULT 49-41010, NO ACCEL SHUTDOWN RECORD AND IS CURRENTLY ON MEL 49-99A. ACFT GROUNDED. ACCOMPLISHED APU BITE PROCEDURE IAW FIM 49-60 TASK 801 AND NO ACCELERATION SHUTDOWN FAULT ISOLATION IAW FIM 49-40 TASK 801. NO FAULTS FOUND. REMOVED AND REPLACED APU FUEL CONTROL UNIT IAW AMM 49-31-11. REMOVED AND REPLACED THE APU LUBE MODULE IAW AMM 49-91-11-000-801. OPS CHECKED GOOD AND NO FAULTS FOUND.