As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
THE FLIGHT CREW REPORTED THE RT ENG ANTI-ICE LIGHT TEST WAS OK WITH THE ROTARY SWITCH BUT WHEN THE SYS WAS ACTIVATED WITH ANTI-ICE SWITCH THE RT SIDE DOES NOT COME ON IN FLIGHT EVEN AFTER A 1 HOUR CRUISE. TROUBLESHOOTING FOUND THE RT TEMP SWITCH DEFECTIVE. NEW SWITCH INSTALLED IAW AMM 30-21-00.