What was found
(CAN) WHEN TROUBLESHOOTING THE WINDSCREEN ANTI-ICE SYS THAT WAS REPORTED TO BE INOPERATIVE BY THE FLIGHT CREW IT WAS NOTED THE WINDSCREEN ANTI-ICE SYS SELECTOR SWITCH "OFF" TERMINAL SHOWED SIGNS OF OVERHEATING. REVIEW OF THE C208 WIRING DIAGRAM SHOWS THAT TERMINAL TO BE UTILIZED WHEN THE SWITCH IS HELD IN "MANUAL" MODE WHICH BYPASSES THE OVERCURRENT/OVERTEMPERATURE PROTECTION IN THE SYSTEM. THE SWITCH WAS REPLACED AND THE SYS TESTED WITH NO FAULTS NOTED.