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Service call that the Second Floor Furnace was not maintaining Temperature. Upon arrival, spoke with Homeowner about issue. Furnace was running and was shutting off due to the Temperature being satisfied at the Thermostat. Recalled Error Codes on Control Board which showed a Lockout Error Code and a Low Flame Signal Error Code. Removed the Flame Sensor and cleaned. Flame Sensor was heavily corroded and is becoming pitted. Cleaned Flame Sensor and tested operation of Furnace. Tested Flame Sensor which was reading proper Electrical readings. Cycled System to ensure it was firing off and maintaining Flame. Cleaned Flame Sensor and tested operation of First Floor System also. Both Flame Sensors measured at 2.8 MicroAmps. This is slightly lower than the readings from the previous visit.