The fuse socket is right above the power inlet. You have to unscrew that little plastic part with the slot in it.
It's a 5amp fuse.
I suspect that is your issue. These things are crazy reliable. If not, Pass will take care of you.
"On the rear panel is a master switch and additionally a fuse holder on the
smaller amps. The fuse holder accepts type 3AG (6.3mm x 32mm) 250
volt glass fuses of the slow blow variety."