As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
PILOTS INNER WINDSHIELD PANE SHATTERED. FAILURE OCCURRED DURING CRUISE AT FL250, OUTSIDE AIR TEMPERATURE OF -35 DEGREES C WITH THE WINDSHIELD HEAT ON. THE CRACKS APPEARED SUDDENLY ALL OVER WITH A LOUD BANG. WINDSHIELD TIME IN SERVICE UNKNOWN. (AL01200405421)