Where can I buy the caps?
If the caps on the DM board are not swollen on the top, they re ok, but if they are replace them.
Mitsubishi sets are notorious for leaking caps. These are the black caps labeled "Nichicon" and sometimes "Rubycon". They are easy to spot because the negative leg has what appears to be dark acid leaking down, the board has a circle of discoloring around the cap and sometimes the copper trace on the other side of the PC board is all black and contaminated. If you know what you are doing, you can remove all of these caps, clean up the board and replace with quality caps, and this usually solves the problem.
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