Tube amp repairs in the Boston area?

Thanks for the recommendations.  

If you want the best it’s worth maybe a it of travel Radu Tarta in CT has made several amplifiers ,preamps for myself and friends  not many in North America 

can match his knowledge base and engineering at Very fair prices !!

Personally,  I would call Dan and see if he could diagnose over the phone.  It may well be something simple as you say, but get his opinion first. If he can’t diagnose it, I would recommend sending it back to him for repair. Unless the tech you know is very familiar with that exact model, IMO, the factory is a safer bet. Take care. 

Good advice.  Dan is taking care of my pal’s issue.