As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
PHL FLT 30 EN-ROUTE LAS TO PHL - DURING THE FLIGHT, THE FORWARD LEFT WINDOW BEGAN TO CRACK AS FOUR SMALL AREAS OF ARCING BECAME APPARENT IN THE BOTTOM CENTER OF THE WINDOW. THE CREW SELECTED THE WINDOW HEAT OFF AND CONTINUED WITHOUT FURTHER INCIDENT. MAINTENANCE REPLACED THE LEFT SIDE WINDSHIELD. OPERATIONALLY CHECKS OK.