9/15/25 - Completed a full heating maintenance on five RTU’s. The filters were changed, heat exchangers were checked, and proper operation was tested. Unit 1 has a very rusted heat exchanger, but it is not breached, so it is still good at this time. Unit 4’s second stage was freezing after the txv, which was previously noted, but that is a cooling issue. Overall, all units were in good condition, they were all heating well, and there were no other issues found.