As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
PIT-SBN - FLT 399 - DURING CLIMB AFTER TAKEOFF, THE LEFT ICE PROTECTION TEMP LOW LIGHT WOULD NOT EXTINGUISH UNLESS THE ENGINE POWER WAS SET ABOVE 78 PERCENT N2. THE AIRCRAFT RETURNED TO THE FIELD AND LANDED WITHOUT INCIDENT. MAINTENANCE REPLACED THE LEFT AIRFOIL ANTI-ICE LOW TEMP THERMOSTAT. (M)