Furnace precision tune up. Ensured heating temperatures are within manufacture specs. Checked power draws and ensured combustion readings were within safe operating levels. Checked gas pressure and found it to be very low. Was not able to adjust. This may be due to incoming gas issue or gas valve issue. Due to age of furnace, no repair is recommended over replacement. Recommended heat exchanger test for Lennox pulse. We will have Chris update you with current specials going on for new system.