As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING DESCENT, W/S AIR O HEAT ILLUMINATED THEN CYCLED OFF THEN ILLUMINATED AGAIN BUT CONTINUOUS. THE SWITCH WAS IN LOW AND COULD SMELL BURNING ODOR. REPLACE WINDSHIELD TEMPERATURE SENSOR AND TEMPERATURE BULB WITH NEW. OPS/LEAK CHECKS GOOD. DONE IN REF.