As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
WITH WING ANTI-ICE SELECTED ON ANTI-ICE DUCT MESSAGE CAME ON SHOWING LEFT WING RED, SAME IN BOTH NORMAL, STANDBY MODES. RETURNED TO SLC. REPLACED 3 THERMAL SWITCHES IN LEFT WING MID SECTION AND HEAT SHRINK INSTALLED ON LEFT WIRE ENDS. RAN AIRCRAFT AND TAXIED FOR 20 MINUTES. NO DISCREPANCIES NOTED. OPS CHECKS GOOD IN STANDBY AND ON POSITIONS.