As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AT FLIGHT LEVEL 330, CAPTAIN'S OUTER WINDSHIELD L1 CRACKED ABRUPTLY. FOLLOWED RED TAB PROCEDURES, DESCENDED TO FLIGHT LEVEL 240 AND REDUCED CABIN PRESSURE. REMOVED AND REPLACED L1 WINDSHIELD PER MAINTENANCE MANUAL 56-11-11. ALSO, REMOVED AND REPLACED HEAT CONTROLLER. REINSTALLED ALL MOLDING AND OK FOR SERVICE.