10/7/25 - Completed a full heating maintenance on four RTU’s. The filters were changed, the heat exchangers were checked, and proper operation was tested. RTU 3 has a cracked heat exchanger, which will need to be replaced. W1 has been disconnected, the gas valve has been turned off, and the gas to the unit has been shut off. The unit will not be heating until the heat exchanger is replaced, but it did seem to be running fine when tested. Overall, the other three units were in good condition, they were running well, and there were no other issues found at this time.