Performed QA on Amana Gas Furnace/AC system for the family/game room. Ran system in heating and cooling. Checked all programming and adjusted the cooling speed tap to F01. Set Heating stage delay to 10 minutes. Some small corrections were made to sealing the ductwork and installing the Service record. Completed checklist form in system. Installed an external Auto Reset Low Pressure Switch on the outdoor unit for the 2nd Floor System. Checked pressure switch connections with soap bubbles to make sure there were no leaks. Ran 2nd Floor system in cooling for over 20 minutes and measured refrigerant pressures. Pressures held at 131/259 in 1st Stage Cooling. Homeowner had a lot of questions about the pressure switch and how it works and the warranty. I talked to her about the repair and what the original issue was. System operating to standards at this time. No follow up is needed.