Complete 7 system furnace repair and preventative maintenance check. The owner supplied their own air cleaners. Checked electrical and safety switches all ok at this time. Did a combustion test and found basement furnace under fire, worn ignition and flame sensor. The theatre room/closet had a water leak at the exhaust of flue pipe. Redo pipe for flue and no leak present at this time. Replaced ignition, flame sensor and calibrated basement combustion. Did a combustion calibration for theatre/closet furnace. All systems heating at this time.