As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CREW REPORTED APU OIL PRESSURE CAUTION MESSAGE IN FLIGHT. CREW FOLLOWED QRH PROCEDURE, DIVERTED AND LANDED SAFELY. MAINTENANCE INSPECTED AND TROUBLESHOT APU AND FOUND APU OIL LEVEL LOW. MAINTENANCE SERVICED APU OIL AND PERFORMED CHECKS IAW AMM. ACFT RELEASED FOR SERVICE.