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Completed heat tune up for 70,000 BTU natural gas furnace 80%Eff. 16x16x1 filter ok Cleaned flame sensor with 0000 steel wool Inspected flues, burners and heat exchanger Measured temperature rise (72-140) Checked gas pressure Inspected wiring, controls, electric motors and components Carbide ignitor is worn and reading just outside of manufacture rating (resistance value of ignitor measured when ignitor at room temperature) Left estimate to replace ignitor with OEM ignitor. Combustion and draft tests: Pass Equipment (including AC) is 24 years old. Williamson should anticipate breakdowns and issues. Would consider upgrading system.