48TCD008A1 RTU 2 years old with HH63AW001 Economizer control. Both compressor contactors badly burned and 2nd stage one was welded together. Another company supposedly replaced the economizer control last July. Today we replaced both contactors due to damage and both still chatter. Disconnected economizer with bypass plug and the unit ran normally. Ordering new economizer box, but any idea where to look for shorts on this unit if control problems persist? Just wonder if there are any favorite spots to look for wire rubs or wires chewed by damper blades and gears etc on this unit.