As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CREW REPORTED THAT THE FORWARD EMERGENCY EXIT WINDOW WAS ICING UP IN FLIGHT. TECH FOUND THAT THE SPRING HOLDING THE PLUNGER FOR THE CABIN WINDOW HEAT HAD MELTED THE BACK PLATE OF THE PLUNGER ASSY AND THAT THE PLUNGER AND CONNECTOR ASSY HAD BOTH BEEN ARCING. REPLACED PULUNGER ASSY AND CONNECTOR ASSY. OPS CHECKED OK.