As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
PDX FLIGHT 2260 - ON TAXI LEFT WINDSHIELD HOT CAUTION LIGHT ILLUMINATED. OAT WAS +5C. WINDSHIELD DID NOT FEEL HOT TO THE TOUCH. MAINTENANCE REPLACED THE LEFT WINDSHIELD HEAT CONTROLLER AND COMPLIED WITH OPERATIONAL TEST OF THE WINDSHIELD HEATING SYSTEM IAW DHC-8 AMM TASK 30-41-00-710-801. OPERATIONAL TEST GOOD. AIRCRAFT RETURNED TO SERVICE.