As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
STATUS MSG: FUEL ISLN VALVE APU. MSG 28-19415,TRIED FIM 28-25-803 RESET, NO HELP. NEEDS MORE TROUBLESHOOTING. REPLACED APU ISOLATION VALVE ACTUATOR, STATUS MSG FUEL ISLN VALVE APU STILL SHOWING AFTER REPLACEMENT OF VALVE ACT. ACP FIM TASK 28-25-803 AND MSG CLEARED.