What was found
AT CRUISE, WITH WINDSHIELD ANTI-FOG AND ANTI-ICE SWITCH ON, FLIGHT CREW REPORTED SPARKS SHOOTING OUT OF PROBE ON CENTER WINDSHIELD. TURNED OFF BOTH SWITCHES, ARCHING STOPPED. FOLLOWED QRH AND PULLED BOTH CIRCUIT BREAKERS. CONTACTED ATL. MAINTENANCE FOUND HEAT SHRINK MISSING FROM SENSOR TERMINALS. INSTALLED HEAT SHRINK AND REINSTALLED SENSOR PER MAINTENANCE MANUAL. OPERATION OF ANTI-FOG AND ANTI-ICE CHECKS GOOD. AIRCRAFT OKAY FOR SERVICE.