What was found
AFTER ABOUT 20 MINUTES IN CRUISE FO WINDSHIELD FOGGED OVER, THEN FROZE. THERE WAS NO ASSOCIATED CAUTION LIGHT. RETURNED TO THE FIELD. LANDING UNEVENTFUL. PERFORMED ELECTRICAL RESISTANCE CHECK OF F/O WINDSHIELD IAW AMM TASK 30-41-00-760-801, CHECKS GOOD. R & R ANTI-ICE RELAYS 3041 K3 AND 3041 K4 IAW AMM TASK 30-41-01-000-802 & 30-41-01-400-802. AS A PRECAUTIONARY MESSURE R & R THE F/O'S ANTI-ICE CONTROLLER IAW AMM TASK 30-41-01-000-801 & 30-41-01-400-801. PERFORMED OPERATION TEST OF WINDSHIELD ANTI-ICING SYS IAW AMM TASK 30-41-00-710-801, OPS CHECK GOOD. NO DEFECTS NOTED. RETURNED TO SERVICE.