As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ON DESCENT INTO BOS, THE FIRST OFFICER'S WINDSHIELD BEGAN TO ARC AND CRACK. CREW FOLLOWED QRH PROCEDURES AND CONTINUED TO BOS. FLIGHT LANDED WITHOUT FURTHER INCIDENT. MAINTENANCE REPLACED THE FIRST OFFICER'S WINDSHIELD. OPERATIONALLY CHECKS OK.