As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AFTER TAKEOFF THE CREW NOTICED A BURNING ODOR COMING FROM THE CABIN AREA. WHEN THE HEATER TEMPERATURE CONTROL WAS SELECTED TO MANUAL AND TOGGLED TO FULL COLD THE ODOR BEGAN TO DISSIPATE. THE AIRCRAFT WAS RETURNED WITHOUT FURTHER INCIDENT. MAINTENANCE PERFORMED A GROUND ENGINE RUN WITH AIR SOURCE HEAT SELECTED. OPERATIONAL CHECKS WERE NORMAL WITH NO NOTED DEFECTS.