As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DCA FLT 1781 EN ROUTE FROM MHT TO DCA, THE FIRST OFFICER'S WINDSHIELD ARCED, THEN CRACKED. APPEARS TO BE THE OUTER PANE THAT CRACKED. FLIGHT LANDED WITHOUT FURTHER INCIDENT AT DCA. MAINTENANCE REMOVED AND REPLACED THE FIRST OFFICER'S WINDSHIELD PER MM 56-11-11-404-001. ALSO, REMOVED AND REPLACED WINDOW HEAT CONTROL UNIT FOR FIRST OFFICER'S WINDSHIELD PER MM. OPERATIONAL CHECK AND LEAK CHECK GOOD.