As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
SJU - AIRCRAFT DIVERTED TO SJU DUE TO CAPTAIN WINDOW OUTER PANE SHATTERED. HEATING ELEMENT ARCING LOWER LEFT EDGE. LANDED SJU WITHOUT INCIDENT. REPLACED CAPTAINS WINDSHIELD AND WINDSHIELD TEMPERATURE REGULATORY AND WINDOW HEAT PROTECTION. SYSTEM GROUND CHECKED NORMAL OPERATION.