Blown fuse

[Lewin]

Hello there

I work as a youth music studio manager in the UK and we have a EUROPOWER-PMH5000 that isn't functioning. I have had a tinker and I've deducted all it needs is a new fuse casing, and fuse, in the back of it as it worked for a short while with another fuse casing that I'd bodged into it, until the fuse blew.

Where would I be able to obtain the correct casing and/or has anyone any advice on fixing this unit so the young people I work with can have a functioning desk in their practise room?

thanks in advance