flyback took a shit. generally when this happens on the K7000 you're looking at replacing a few items... which may or may not include: HOT, C36 cap, voltage regulator (that's IC4 I think?), potentially the fuse, and obviously the flyback. if the chassis hasn't been re-capped, you will want to install a cap kit as well.
my K7000 that blew up seriously put a dime-sized hole in the bottom on one half of the C36 cap, so I had to not only replace all those other parts, but I had to rebuild the charred traces with diode wire. I even replaced my yoke connector pins, because it hit the red wire as well.
my hacks worked. they're relatively easy to work on.
EDIT: also, not trying to be captain obvious, but you need to do something about all that dirt lol. when you lodge those things up with dirt it just makes everything run hotter and thus more failure prone.