As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CLE FLIGHT 3683 THE CREW REPORTED THE APU FAILED IN FLIGHT. ATTEMPTED RESTART BUT IT WOULD NOT CONTINUE TO RUN. MAINTENANCE PERFORMED OPERATIONAL CHECKS ON APU AND NO DEFECTS WERE NOTED. OPERATIONAL CHECKS WERE GOOD. THE AIRCRAFT WAS RELEASED FOR SERVICE.