As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
MFR - FLIGHT 2150 - SHORTLY AFTER TAKEOFF, THE LAV SMOKE DETECTOR WENT OFF. THE FLIGHT ATTENDANT CHECKED AND SAW NO SMOKE, BUT DID SMELL A HOT DUSTY SMELL. RETURNED TO THE FIELD AND ACCOMPLISHED A UNEVENTFUL LANDING. AIRCRAFT FERRIED TO PDX FOR REPAIRS. IN PDX, MAINTENANCE REPLACED THE NR 2 ENGINE AFTER FINDING OIL ON THE HP IMPELLER. OPERATIONAL CHECKS GOOD. AIRCRAFT RETURNED TO SERVICE.