As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) WHILE ON ROUTE, AT 23,000 FEET AT 12 NOON, OAT -25 C, WINDSHIELD HEAT ON. THE PILOTS (LT) INNER LAYER OF WINDSHIELD FRACTURED WITHOUT WARNING DURING FLIGHT. NO LOSS OF CABIN PRESSURE OR OTHER EFFECTS FROM WINDSHIELD DELAMINATING. EMERGENCY WAS DECLARED AND THE AC WAS LANDED WITH OUT FURTHER INCIDENT.