What was found
DURING CRUISE, CREW REPORTED THAT F/O'S WINDOW ARCING & BEGAN TO CRACK. DIVERTED & LANDED WITHOUT FURTHER INCIDENT. MX R & R F/O'S NR 1 WINDOW IAW AMWEST TASK CARD R1B56001. ALSO, R & R FORWARD WINDOW HEAT CONTROL, FOR PRECAUTIONARY PURPOSES, IAW BOEING 737-300 MM 30-41-11-4. OPS TESTS GOOD. UPON TEARDOWN ON WINDOW HEAT CONTROLLER, FOUND COLD SOLDER JOINT ON SCR DRIVER CIRCUIT CAUSING INTERMITTENT OPERATION. VENDOR REWORKED PC BOARD. VENDOR REPAIRED UNIT IAW KOITO CMM 30-40-03 REV. 6. WINDOW WAS SCRAPPED AT VENDOR.