As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
STRONG ELECTRICAL BURNING ODOR DURING DESCENT, JUST AFTER WINDSHIELD HEAT WAS TURNED ON. CREW DEACTIVATED WINDSHIELD HEAT, TURNED ECON OFF AND ISOLATED THE NR 1 PACK. FUMES DISSAPATED. CREW COULD HEAR MOTOR FAN THAT SOUNDED AS IF IT WAS BINDING. FUMES SEEM STRONGEST AROUND C/B PANEL. FOUND AVIONICS COOLING FAN NR 3 WITH C/B POPPED. REPLACED FAN. FAN OPS NORMAL. C/B REMAINS CLOSED.