4 March 2025 - replaced heat exchanger under part warranty. Discovered multiple cracks on heat exchanger when removed. Installed new heat exchanger and tested operation of furnace. Supply gas pressure is a touch low, furnace calls for 12.0”wc minimum, measured pressure was around 11.6”wc Recommended homeowner call gas supplier to come in nd make adjustments to their regulators and then double check furnace pressures to ensure they are still within range. Performed combustion test on new heat exchanger, al readings were good, system is burning cleanly and efficiently at this time. Recommend yearly inspection on furnace to ensure this problem does not reoccur in the coming years