I would suggest reposting your request in Electronics, where there's a greater chance it would be seen by someone who would know more about that.
Any local electronics shop should be able to help you troubleshoot where the problem is. Have you checked with your authorized Boss dealer in your area?
------------------
Brad's Page of Steel
A web site devoted to acoustic & electric lap steel guitars
Your remarkable non-peddle amp
Moderator: Brad Bechtel
I'm selling a super cool little Epiphone amp here: http://steelguitarforum.com/Forum17/HTML/002945.html