I read through your post and yes,we still need to stick positive rail.I do notice that the ohm reading is considerable low, which meaning there is something pulling the current.Since the +/-18V is supplying the preamp module too, can you remove all of them and measure the voltage again?And of course, those caps around the +18V rail might be the culprit too, but we can work on the module first.
The clarify, which module? Or disengage the whole circuit by desoldering the first component?
The clarify, which module? Or disengage the whole circuit by desoldering the first component?
Hint : vertical PCB with metallic bracket
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