As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CREW REPORT) WHILE ON OUR FLIGHT FROM KSTL TO LFSB AT FL390 ABOUT 100 MILES EAST OF TORONTO WE EXPERIENCED A LOUD BANG. WE REALIZED THE LEFT FRONT PILOT WINDSHIELD HAD CRACKED. WE RAN THE CRACKED WINDSHIELD CHECKLIST AND MADE ADJUSTMENTS TO SPEED, ALTITUDE AND PRESSURIZATION PER THE CHECKLIST. WE DECIDED TO RETURN TO BASE AT KSUS AIRPORT WITH NO FURTHER ISSUES.