As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
THE CREW REPORTED THAT IMMEDIATELY AFTER TAKEOFF THEY NOTICED A STRONG ODOR, SMELL, FUMES THROUGHOUT THE ACFT. THE CREW DECLARED AN EMERGECNY AND RETURNED TO DEPARTURE. THE ACFT LANDED WITHOUT INCIDENT. THE ACFT WAS REMOVED FROM SERVICE. R & R THE NR 2 RECIRCULATION FAN AND PERFORMED ENGINE RUNS. THE OPS CHECK WAS GOOD IAW ETN-EM-72-034 NO ODOR OR FUMES. THE FUNCTIONAL CHECK FLIGHT WAS GOOD. THE ACFT WAS RETURNED TO SERVICE.