Wow thank you very much, that took time to answer in such a manner. I really appreciate your help and informations. You guys are great. C83 just does beep and has 0 resistance when testing, C84 and C85 both have 2.3k Ohm and don't beep. If the guides out there are right, the caps should be fine. Tested them outside the board with the resistance mode, the guide said, if it loads up in resistance mode and goes to infinity they should be fine. I hope that's right. The voltages are fine on the amp board. I have the 5v, -15/15 and the 60 volts. The smartphone with the thermal camera from my gf shows it's hot around the area of On/Of/Auto and Gain knobs, but it's very broad. It doesn't show specific values nor the exact area. I wasn't able to get new caps yet. Looks like I need to buy stuff for 50€ on DigiKey to get all the stuff. Because otherwise I pay about 18€ for shipping only :d
Edit: Okay, I guess desoldering the 16v 22uf or (220uf)? wasn't a good idea because I destroyed the port and a little bit of the line on the upper side xD
Will try to find a repair cafe near, before I do even more damage. Soldering/Desoldering lead free is hard. I remember it was much easier with lead =/
Theoretically if I make the red outline blank that the copper shows up again, I could put solder on it and connect it to the other side right?
Thank you @Roamin and all of you.