M7 amps no power on


JR M7 is pretty old amps. Mono 350 w/chanel. You have to pay tons of money on this much amps  these days.
Amps  don't turn on  after few years storage. Only big thump then no power . Fuse are all good even inside one too.
Only led lit for +12v,-12v. JR said repair ticket # is created but didn't send link where  I can look. I wonder anyone know that link. Amp worked fine before storage . Thanks, john
jny08