As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
THE CREW REPORTED THAT A POP WAS HEARD AT THE TOP OF CLIMB, MILD SMOKE ODOR IN COCKPIT AND CABIN, WITH THE ODOR GETTING WORSE AT HIGH POWER SETTINGS, AND WENT COMPLETELY AWAY AT LOW POWER. THE ACFT LANDED WITHOUT INCIDENT WHERE MAINTENANCE INSPECTED THE ACFT AND FOUND THE CABIN RECIRCULATING FAN TO BE INOPERATIVE. R & R THE RECIRCURLATING FAN, OPERATIONALLY TESTED WITH NO DEFECTS NOTED.