I just purchased one a month or so ago that had a faulty power supply, it was working, but would loose signal after about 30 mins running. I replaced all the caps in the power supply (except for the big one, couldn't find a replacement), only cost a few dollars at Jaycar.
Luckily, I still have the replacement cap list with Jaycar part numbers on the PC.
2 x 47uf 63v - RE-6344
1 x 100uf 35v - RE-6334
2 x 100uf 25v - RE-6322
4 x 100uf 16v - RE-6310
2 x 1000uf 16v - RE-6316
1 x 470uf 25v - RE-6326
2 x 220uf 35v - RE-6336
1 x 1uf 50v - RE-6032
I also hooked a 50mm fan up to the power supply while I had it apart, I just connected the the fan to the +8v and GND lines on the powersupply output, they're labeled, so it's easy to find.
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