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Performed heating maintenance, checked air filter, left new filter. Inspected heat exchanger, cleaned flame sensor and burners. Checked voltage, amperage and electrical connections. Started gas furnace, measured fuel pressures, performed combustion test. Checked operation and temperature rise. Christina complained that the basement is cold during the summer when running the air conditioner, checked basement damper, found opening and closing. Checked minimum position is closed. Ran heat checked blow by found very little air blow by.