As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING CRUISE OPERATION THE R1 WINDOW BEGAN ARCING AND GLOWING RED. WHILE DESCENDING, THERE WAS A LOUD BANG AND NOTED THAT THE WINDOW HAD CRACKED. AN EMERGENCY WAS DECLARED AND THE ACFT LANDED WITHOUT INCIDENT. R & R THE R1 WINDOW AND WINDOW HEAT CONTROLLER. NO OTHER DEFECTS WERE NOTED. ACFT WAS RETURNED TO SERVICE.