As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING PILOTS PREFLIGHT, TRIP CANCELLED, LT ENGINE ANTI-ICE LIGHT DID NOT STAY ON DURING OPERATIONAL TEST OF SYSTEM. TROUBLESHOOTING POINTED TO THE LT NACELLE COOLING AIR INLET ANTI-ICING SENSOR (SWITCH). THE CONTACTS IN THE SENSOR WERE FOUND STUCK. REPLACED THE FAULTY SENSOR (SWITCH). OPERATIONAL TEST OF ANTI-ICE SYSTEM SHOWED NO FURTHER DISCREPANCIES.