The link at the top of the Hardware Forum gives me a least of ISF-certified dealers, but I'm interested in finding a technician to work on existing equipment. I'd like to hear any experiences good or bad; if there's any concern about confidentiality, please feel free to email me (link above). I used to use Gary Merson of Home Theater Perfection, but recently it's become almost impossible to get him to return a call. Thanks in advance! M.