Tube amp repair.

Hi, my name is Brian and I'm new to to the site and forums in general so let me know if there is somewhere else I should be asking this question.... My 1st tube amp was a Chinese Yaquin MC-100SE (ya I know, that's my problem right there, lol) that sounded pretty decent at first then started occasionally red plating the kt88 tubes. At the time I also did not know about using a Variac so this could could have started the problem or it it could just be a 50 lb paperweight. Anyway I'm wondering if anyone knows of someone in Minnesota (preferably SE Mn) who does tube amp repair. The thing has been taking up space for a few years and I'm trying to figure out what to do with it. Not sure it's worth the cost of sending it anywhere but thought if there was someone within drivin distance that would take a look I might do that.