What was found
PHL - FLT 107 - EN ROUTE PHL - SEA, DURING CLIMB-OUT FROM PHL, THE FIRST OFFICER'S WINDSHIELD CRACKED. FLIGHT RETURNED TO FIELD IN PHL AND LANDED WITHOUT FURTHER INCIDENT. MAINTENANCE REPLACED THE FIRST OFFICER'S WINDSHIELD. ALSO, REPLACED THE NR 2 WINDSHIELD HEAT COMPUTER.