40W Digital Mixer Amplifier (parts) (Withington M20)

Adastra DM40 40W 100V Line Digital Mixer Amplifier with BT/FM/USB Ceiling.

Used with an 100V 20W speaker for 2+year and stopped working one day.
Fuse was blown.
Replaced fuse without any connection and fuse is blown again.

Opened up and I can see a part of circuit board is burned, as shown in photo.

Suits anyone in a position to repair it. It seems that there are parts still intact and can be used as replacement parts for another amplifier too.

Any questions, feel free to ask.