First thing I spotted was a leaky electrolytic capacitor. Since there was one leaky one found here I suspected more caps to be bad. And yes, indeed, there were a lot of these bad caps in here. Everybody can clearly see in my pictures that these did leak substance (pissing electrolyte) out of their legs. This substance is an agressive one. Over time this will damage the traces and damage your synthesizer. You should take care of it and go to a tech (like me) and let it check. Now it`s still an easy fix and more than worth it. Once there is damage it's way more things to repair if even possible. Check my other repair stories such as the Korg PS3200 for more details.