As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CLT TO IAH - APPROXIMATELY 40 MINUTES INTO THE FLIGHT THE CREW RECEIVED AN APU OIL TEMP MESSAGE ON EICAS. THE AIRCRAFT DIVERTED TO ATL WHERE IT LANDED WITHOUT INCIDENT. MAINTENANCE SERVICED THE APU WITH OIL AND IT OPERATED NORMALLY, AND THE AIRCRAFT WAS RETURNED TO SERVICE. THE APU OIL TEMP BULB WAS LATER REPLACED ON 2/8 AND THE APU, OPS CHECKED GOOD.