What was found
BOS - FLT 1665 - ON CLIMB-OUT FROM PWM, AT FL190, THE FIRST OFFICERS WINDSHIELD SHATTERED. CAPTAIN DECLARED AN EMERGENCY AND THE FLIGHT DIVERTED TO BOS. FLIGHT LANDED WITHOUT FURTHER INCIDENT AND TAXIED TO THE GATE. PRIOR TO THE WINDSHIELD SHATTERING, THE CREW NOTICED AN ELECTRICAL ARE AT THE TOP OF THE WINDSHIELD. MAINTENANCE REMOVED AND REPLACED THE FIRST OFFICERS WINDSHIELD PER JOB PROCEDURE CARD. ALSO, REPLACED THE RIGHT FORWARD WINDSHIELD HEAT CONTROL BOX (P/N 83000-05602). OPERATIONAL CHECK OF WINDOW HEAT CHECKS GOOD. (M)