As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ASH FLT 7266 ORD. APU OIL TEMP MESSAGE OCCURRED IN FLIGHT. CSD2 WAS ALREADY ON MEL. CREW DECLARED AN EMERGENCY AND LANDED UNEVENTFULLY. CREW REPORTED SHUT DOWN THE APU, DID NOT AUTO SHUT DOWN ON THE GROUND. MX REPLACED OIL FILTER, OPS CHECKED GOOD.