Arrived to do a performance maintenance. Found that one of the fittings for the flue was leaking condensation. Found that this fitting disconnected very easily. Cleaned the fittings and glued them back into place. Replaced furnace filters and humidifier panel with homeowners approval. Set up for combustion analysis temperature split and static pressure tests. Verified operation of all mechanical and electronic components of the furnace. Checked blower for cleanliness and to see if there is any play in the bearings. Checked systems heat exchanger to ensure proper venting of flue gas. Performed an electronic gas leak search. Verified operation of the humidifier. Double checked the flue fitting that was repaired to ensure it is no longer leaking. Furnace and humidifier are operational at this time.