What are the numbers on the regulator ic's? especially the negative one. Doe the transformer only have 2 wires supplying the board or is it center taped?
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There are two voltage regulators with large heat sinks on the board. One gets warm, and the other is room temp
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you might want to indicate which one gets warm, is it the positive one or the negative one?
If you don't have a balanced circuit +15 and -15, you could see some positive voltage on the negative supply.