To answer your question, yes...Dave can upgrade your amp to current specs. I have #0075 and it should be arriving at Tone Merchant next week for Dave to work on. My amp was previously worked on by Dave, and he installed the full clean as well as the two button footswitch capability. I'm having him replace the buzzy transformer this time as well as reduce the white noise I'm getting in the BE/HBE modes. He usually answers my emails, but like the previous poster mentioned, he is extremely busy and I'm sure he doesn't mean to not respond. He mentioned in the last email to me that he'd be able to get to my amp in about a week, which I think is very reasonable.
Have you tried emailing Dave directly, or have you been emailing the address(s) on the website? So far I've been treated well by Dave, and I appreciate how he responds in a kind way to others on this forum....always willing to help.