As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CREW REPORTED AN APU OIL TEMP CAUTION IN FLIGHT EN ROUTE FROM CLT TO STL. CREW DIVERTED TO TYS AND LANDED WITHOUT INCIDENT. MAINTENANCE INSPECTED AND FOUND THE DELTA-P POPPED ON THE APU OIL FILTER. MAINTENANCE REMOVED AND REPLACED THE APU OIL FILTER ELEMENT, SERVICED THE APU OIL AND PERFORMED CHECKS USING THE AIRCRAFT MAINTENANCE MANUAL. AIRCRAFT WAS RELEASED FOR SERVICE.