No more sound out of monitor output to 4x12 cab after electric went out on stage.

So i have this power rack version and today just before soundcheck I was allready warming up and everything went fine.

Suddenly all the power went out on stage so everything needed to be rebooted.

Now since then there is no sound comming out of my 4x12 cabinet, neither with other cables or cab. Sometimes it pops/crackles with high volumes...

The main out to FOH still works.

In the video you can hear sound comming from my studio monitors and then I shut them off and you should hear my 4x12 cabinet...

Have I run into a hardware malfunction of the poweramp?

Link to a video:

VID20240504182019.mp4

Thx in advance

I've done a factory reset wich didn't solved it.

I opened it up and didn't see someting strange, fuse is allright too.

Contacted Support.