As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CSS FAILED, 3 ATTEMPTED STARTS. FL360, SAT-45 DEGREE. APU WOULD HAVE ATTAINED AN EGT OF 1000 DEGREES BUT FAULT LIGHT WOULD ILLUMINATE AND START WOULD ABORT SEQUENCE. ACFT GROUNDED. PERFORMED APU BITE IAW FIM 49-60 TASK 801. FOUND FAULT CODES 49-31016 AND 49-41010. REMOVED AND REPLACED FUEL CONTROL UNIT IAW AMM 49-31-11. GROUND START VERIFICATION SUCCESSFUL, NO LEAKS NOTED, NO FAULTS NOTED.