I preformed a furnace tune up today, flame sensor was not reading properly (was replaced and tested). filter was dirty and causing static pressure issues due to size, it is a cleanable one, I recommended for them to clean it once a month and to look into a 4†filter rack when replacing the furnace. Mild water damage in the furnace nothing damaging though. Gas line did not have a drip leg i made this known to the customer and they had me put one in. Everything was running as it should. Furnace was running when i left.