Now you may have noticed the word "Repair" in the title. This is because the unit was being sold as not working and indeed when i powered it up all you get is a transformer buzz. After a bit of looking around i quickly noticed that a tantalum cap was looking rather toasty on the digital board. As you can see its pretty much black and since tantalum caps tend to blow in to a short circuit this would be a pretty good reason why the unit doesn't want to turn on.
After a quick pray to the electronics gods i desoldered the capacitor in hopes that that it didn't blow due to the supply rail being too high. Put everything back together, powered it on and HEYO it boots up fine with no errors. Checked its output with a multimeter and it was working perfectly! That was a pretty straightforward fix.
While it does work without any capacitor there its still better to replace it. None of the same footprint tantalum caps in my parts collection had a 35V voltage rating so i instead put in a 10uF 63V electrolytic cap with the leads bent for SMD mounting.
I also found another issue with the unit in that the knob on the front was really lose and wiggly, but it seamed to still work. For that i pulled off the front panel and once the board was out the problem was pretty obvious on visual inspection. Looks like someone gave the knob a really good knock in order to rip the top part of the encoder off. This looks worse than it actually is. I was able to bend the tabs back in to place and i also added a drop of super glue to each one to hopefully hold it a bit better. After that the knob felt as good as new and worked perfectly.