As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
EN ROUTE FROM LAS TO SEA FLIGHT CREW NOTICED THE FIRST OFFICERS WINDSHIELD ARCING AT THE WINDOW HEAT SENSOR ON LOWER PART OF THE WINDSHIELD, AFTER A FEW MINUTES PASSED THE WINDSHIELD CRACKED. ACFT DESCENDED TO A LOWER ALTITUDE, DID NOT DECLARE AN EMERGENCY. MAINTENANCE REMOVED AND REPLACED FIRST OFFICERS WINDSHIELD IAW T/C R1B56001, INSPECTED WIRING AND PERFORMED WINDOW HEAT CHECK, SYSTEM CHECKED GOOD. DUE TO HIGH TIME ON THE WINDSHIELD A FAILURE ANALYSIS REPORT WILL NOT BE REQUESTED.