Checked the East Trane Ground mounted Rtu for the Annex gym for odor complaint into the space during the heat cycle. Inspected the heat exchanger and found the tubes rusted thru and a rust hole in the burner barrel. Disabled the heat for safety. Will quote replacing both of the units as the West unit has been disabled for the same issue. Replaced the run capacitor for the blower in Rtu #21C. Capacitor was removed for use in a classroom unit at a earlier date. Checked the Tracer system for a too cold complaint on Rtu 32 for the grade school addition. Found the system not running due no call from the Tracer EMS. Found the offset at 2.5 degrees for the room setpoint. Changed the offset setpoint to 1.5 degrees. Veried operation after the changes.