I don't think I would be quick to short anything to ground. If possible I would measure the forward voltage drop across one diode then the other. Typically I would guess you should see about 0.6 Volts. That should be stable. My problem with your symptoms was the diodes were breaking down in my case. You can give your other thoughts a try. Without seeing a schematic I just don't want to suggest grounding anything.
Ron
Ron
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