if you cant find something locally.. the internet should be able to help you find a place to ship the hardware to get fixed.
be sure you use paypal for a legal receipt in case the person doesnt give you the amp back.
you could use ebay.. sometimes people post their services on ebay for like .99 cents or $1
sometimes they post an ad for $10 and you take that $10 off your final cost of the repair.
google has a national listing for yellow book.
that means you can look for any electrical repair shop that has the telephone number listed.. anywhere in all 50 states.
if you look on ebay long enough at certain amps, if there is a repair service for that amp it will come up in those listings usually . i would find a few amp repair service listings and then just ask if they could fix your model