Reece, try giving these people a call for your amp. They are a service center for many known brands of gear. I've not yet used them myself, but this contact information came to me with some high praise and credibility. I was told "if these guys can't fix something, it can't be fixed...period."
Audio Electronics
10870 Plano Rd. Suite C
Dallas, TX 75238
214-349-5000
I did call them for info on fixing an old piece that I have that no one else will touch. I happened to have had the piece at a new repair place here in NJ that I thought wouldn't be able to fix the piece, so I was ready to ship it out to these guys in Texas. The guy in NJ fixed it though luckily. But it never hurts to have a credible contact for repairs. :) Good luck.
-Danny