As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
PILOTS REPORTED THAT WITH THE CAPTAINS WINDSHIELD HEAT ON ONLY, A NOTICEABLE BURNING ODOR IN THE COCKPIT OCCURRED AFTER 3 MINUTES. MX INSPECTED THE LT WINDSHIELD HEAT CONNECTIONS AND FOUND A LT GROUND TERMINAL TO WINDSHIELD HEAT LOOSE. MX TIGHTENED CONNECTION AND PERFOMRED AN OPS TEST OF THE CAPTAINS WINDSHIELD HEAT SYS. NO ODOR OR BURNING WAS NOTICED. OPS CHECK WAS GOOD IAW MM 30-40-00.