Furnace Maintenance: Old water damage found on the outside of the p-trap, added silicone to prevent any future leaks. Added vinegar to the trap to prevent build up and clogs. Flushed the condensate P-trap and drain lines to maintain clear, efficient flow. Checked pressure switch tubing to ensure reliable performance. Cleaned and polished the flame sensor for optimal ignition. Ran full diagnostics to confirm the system is running smoothly and efficiently. Aldo & Lesley