Faulty RF T8002 Amp

Hi!
I Have a RF T8002 Amp that is not working.
I havent been using it for 7-8 years and when I put it away it was because it was broken. Now im gonna try to fix it.

I plugged it in yesterday to see how it acted.
When plugging in B+, GND and Remote signal (without plugging in speakers or RCA)

After about 5 seconds it burned a 40 amp fuse mounted on the the B+ cable.
The amp also makes a howling sound.
After putting in a 60amp fuse the fuse doesnt burn but the cable got very hot.

The howling sound from the amp still goes on.

20200504100047-85.24.204.183.jpg


Those black things mounted on the wall also gets very hot (only the 4 showed in the picture, the others dont get hot)

Could those be faulty and where can I buy them?
Or can it the something else that is broken?

Appreciate every help I can get.