As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT WAS GROUNDED: PILOT REPORTS FLIGHT DECK FORWARD WINDOW HEAT ARCING (MIDDLE OF LH WINDOW AT THE BOTTOM). MAINTENANCE INSPECTED L WINDSHIELD IAW AMM 56-11-11. NO EVIDENCE OF ARCING OR BURNS. TROUBLESHOOTING LED TO WHC 1. REMOVED AND REPLACED WHC 1 IAW AMM 30-42-34. OPS CHECK GOOD.