As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
APU WILL NOT START. NO LIGHT OFF. MADE THREE ATTEMPTS. FAULT LIGHT ILLUMINATED MAINTENANCE MESSAGE 49-31166 - FUEL CONTROL UNIT SHOWS SOLENOID HIGH CURRENT NO FLAME SHUTDOWN. REPLACED APU FUEL CONTROL UNIT IAW AMM 49-31-11. OPS CHECK GOOD, NO DEFECTS NOTED.