If it does need shutter work I'll second the Youxin Ye recommendation.
He can even get a resilvered mirror to get the rangefinder back in usuable shape.

Just google his name as I don't have his contact info handy.
Super dude and usually doesn't have the backup most of the others do.

Essex (in NJ) is another good one but I'd call them first as there is info that Hurricane Sandy messed with them.