Upstairs fireplace. Lit pilot and cycled system. Found that front glass panel is not sealed causing possible CO to leak from fireplace into home. Fireplace is an uncertain and it is very old. No electrical ignition to gas valve. System has a knob that is located next to hearth that initiates full flame. System is not fully safe. Recommend contacting Darby Stone and Brick for solutions. Cleaned system. Operating normal at this time. Downstairs fireplace. Lit pilot. Cycled system. Found that gas valve springs are worn causing it to be very difficult to go from pilot setting to on . No electrical ignition to this system. Door is also not sealed, causing possible CO to leak into the home. Customer is aware of both doors and the possible outcome from it. Heavy rusting found in bottom of fireplace. Unable to read numbers of this unit. Cleaned unit, system operating normal at this time. Furnace. Cycled system. Checked heat exchanger. Found heat exchanger extreamly rusted and damaged. Did no