As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CREW TURNED ON HEATER PRIOR TO DEPARTURE FROM HYA. ON CLIMB-OUT, PILOT NOTICED FUNNY SMELL, TURNED OFF HEATER. PASSENGERS INFORMED CREW OF SMOKE IN CABIN. RETURNED TO HYA FOR UNEVENTFUL LANDING. MAINTENANCE FOUND HEATER FAN DROP RESISTOR BURNED. REMOVED AND REPLACED ASSY, HEATER FAN SYSTEM CHECKS OK. RELEASED AIRCRAFT BACK TO SERVICE. (X)