As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
SJU - DURING CRUISE, WINDSHIELD HEAT WIRE HARNESS SHORTED AT R-2 WINDOW CAUSING ARCING AND SMOKE IN COCKPIT. TURNED OFF WINDSHIELD HEAT AND DISCHARGED HAND EXTINGUISHER. REPLACED WINDSHIELD WIRING HARNESS AND WINDSHIELD HEAT CONTROLLER, MFG P/N 27261298-02. WINDSHIELD HEAT OPERATION CHECKED NORMAL.