As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
RECEIVED LT AND RT WING ANTI-ICE CAUTION MESSAGES DURING CRUISE. C/W QRH, MESSAGES PERSISTED. WING ANTI-ICE ON ADVISORY MESSAGE NOT PRESENT. DIVERTED TO PIT. AIRCRAFT REMOVED FROM SERVICE. REMOVED AND REPLACED TEMP CONTROL UNIT, IAW AMM 30-12-19. OPERATIONS CHECK GOOD. P/N 1151336-1, S/N OFF 103C-1687, S/N ON 021C-0711. - LN.