Call ML (see manufacturers section). I had a problem with my MLs once (does not sound like I had the identical problem you do) and one of their engineers in the service department was very helpful. I was afraid I would have to send the whole speaker (quest) to them, but by talking to their head of service (sorry, I forget his name) I was able to send the power supply and transformer only to them and within a week had it back and in new shape for about twenty bucks. Hope this helps.
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