Duracell powerblock 660 ( DR660PSS ) I think Inverter is dead

[Dacflyer]

Customer brought me one of these Duracell powerblocks. The inverter part is dead, everything else works ok.
Is there a fuse in the Inverter? I do see a 200A fuse for the external battery, but i don't see one for the Inverter.
Anyone work with one of these yet ? I'd hate to take it all apart just to find that there's no fuse..