Leonard L Alvarado , TX March 31, 2024 Appliance: Model NOT VISIBLE-UNIT OVER 30 YEARS OLD Refrigerator too old for error codes kitchenaid top mount s x s stopped up heat exchanger Replaced heat exchanger - needed brazing torch-silver solder-access valves-gauges-134A gas Read More... Do-It-Yourself Rating: Repair Time Estimate: 2+ hours Tools: Nut Drivers, Pliers, Screwdrivers