As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ENROUTE IN ICING CONDITIONS, WS HEAT NR 1 FAIL EICAS CAUTION MSG PRESENTED. AOM 1 EMER & ABNORMAL PROCEDURE COMPLIED WITH & MSG RESET. HOWEVER, AFTER TWO MINUTES THE SAME HEAT NR 1 FAIL EICAS CAUTION MSG PRESENTED AGAIN. REMOVED & INSTALLED SERVICEABLE NR 1 WS HEAT TEMP CONTROLLER IAW AMM 30-42-01. FUNCTION CHECKED GOOD.