As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
WINDOW R1 HEATING ELEMENT ARCING AT SOLDER JOINT UPPER PORTION OF WINDOW TO RIGHT OF HANDHOLD. ARCING STOPPED ON TOUCHDOWN. GROUNDED - YES. REMOVED AND REPLACED NR .1 RT WINDOW REF B737-900 AMM 56-11-11/401. RELOCATED POWER LEAD AT IB 5012 TO TERMINAL NR 1 REF B737-900 WDM 30-41-12.