Have a 10 ton HVAC unit supporting a computer room on and military base in South Korea. Alarms are "Loss of air flow" and "Overtemperture" Sure overtemperature will ocur with no air flow.-- Filters are clean, blower drive belts and wheels are in good shape-- I think the problem is with the small pc board with the single sensor on it. "Senser Board-- Part number 0617222. Here is the problem-- this unit was made in Australia and the factory closed and went to China. Assuming this is the problem, Where can I get a new board?