Sony SA-WM500 (St Cloud)

My 22 years old subwoofer finally gave in.
Discovered a blown fuse, replaced, blew the new fuse immediately, replaced again but this time with my DVM attach, again it blew and saw magic blue smoke coming off a smaller board.
Free to anyone who does component repair and soldering.
It's beyond my capabilities, else it's going into electronic recycling should no one collect it.