Jake Kring. 02-05-25. I arrived for a tune up on two systems. I inspected and replaced the Fulton the system that is not covered by the maintenance plan and I discussed this with the owner. We decided to go ahead and replace the filet and replace the broken thermostat in the lobby area. Once I replaced all filters I checked both systems and found the heat exchanger to have failed on the oldest system here. I showed the owner the issue and he wanted an estimate to replace the system and have it sent to him for him to go over. I will be following up with the owner by the end of this week.