As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
PILOT REPORTED BURNING SMELL, NOTED WITH CABIN HEATER SWITCH ON. INSPECTED & OPERATIONS CHECKED HEATER OPERATIONS. FOUND DUCT THERMOSTAT SWITCH OUT OF ADJUSTMENT, RUNNING TOO HOT, ADJUSTED SWITCH TO WITHIN LIMITS. OPERATIONS CHECKED GOOD.