As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FOREIGN SMELL IN COCKPIT & CABIN REPORTED. THE DECISION WAS MADE TO RETURN TO FIELD. THE PILOTS DONNED THE OXYGEN MASKS & DECLARED AN EMER. THE FLIGHT LANDED WITHOUT INCIDENT. NO CABIN ODOR FOUND AT EACH INDIVIDUAL PACK. NO 90 DAY HISTORY, OK FOR SERVICE.