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Yeah my current problem is trying to lift the PCB from the casing. Despite removing all the screws already I can only lift it up it very slightly.

Found out that the AUX1 circuit contacts stays closed no matter what (tested with continuity tester). I'm thinking that relay has gone bad even though it still clicks with each button press. Everything else tested okay (AUX2 & AUX3, timer functions). Has anyone ever taken one of these apart...