Beware the power supply - some parts on that board produced a lot of heat. So much so that in the case of the KA-7300 I attempted to refurbish, there were areas of that board that literally crumbled from handling while working on it.
In my case, the amp was functional but had what I felt was high DC offset - 95mV (give or take) on one channel and I figured replacing a goodly number of parts should do the trick. Even though the chance of capacitors causing DC offset was small. I decided replacing all of them was a good place to start and get that work out of the way before moving on to the transistors on the amplifier board.
I've re-capped pre-amps, power amps and a couple of integrated's before but those were all a lot simpler than a KA-7300. At the time, I was under the impression that arbitrary replacement of electrolytic capacitors was a routine thing to do in restoring an amplifier. But in hindsight, I wish I never embarked on that project as more problems were created along the way. I shall not make that mistake again
Despite help from members here, I was unable to get the amp back to operational condition. I was, by my own hand, over my head with that one. The amp was free but I spent a lot of time and money locating, gathering various circuit board components. I can't get the time back but I sold some of the amplifier's parts which covered the cash outlay.
Being one, I would not recommend delving into such an amplifier to an amateur. It is a big, complicated job and things are not easy to get at. There are a lot of embedded resistors in the boards which I've never encountered before and for me, they made checking for voltages a lot less straight forward.
But if you are an experienced tech with test equipment, disregard the above.