As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
F/O'S EXTERIOR WINDSHIELD CRACKED IN FLIGHT AT FL400 AT APPROX 30W. ALSO ACCOMPANIED BY ECAM ANTI-ICE RT WINDSHIELD HEAT. F/O WINDSHIELD BEGAN ARCHING. WHC2 RESET BREAKER PULLED. MX REPLACED F/O WINDSHIELD AND ALSO WINDOW HEAT CONTROLLER.