Vintage amp repair in Southern New England

I have an amp that is used in a secondary system but recently stopped working. I've checked the usual things and isolated the problem to the amp - a Marantz Model 15. I'm not quite ready to give it up, but have been unable to find a local repair shop (I'm in RI). I'd prefer not to ship as I've had a couple bad experiences with relatively heavy equipment. Can anyone provide information as to where I might bring the amp? Thanks!