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You may find it difficult/impossible to find a 1990 type controller -- when I upgraded my 91 controller I switched over to one of the newer models which required me to replace the magnetic door switch. The newer controllers operate differently than the old models and require a magnetic door switch which works opposite of the old ones. You can find new model controllers on EBay, Amazon etc. Another alternative maybe having someone repair your old controller -- recall there is at least one outfit that provides that service - worth a Google.
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