As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
SMOKE IN THE CABIN AFTER 5 MINUTES OF FLIGHT, SIGNIFICANT SMELL. THE SMOKE DID DIMINISH AFTER HEAT WAS TURNED OFF AND AC TURNED ON. CORRECTIVE ACTION: INSPECTED AND CLEANED AREA AROUND HEATER VENTS. PERFORMED GROUND RUNS WITH NO DEFECTS NOTED. UNABLE TO DUPLICATE ANY ISSUES.