Hmmm, I think it would have been better to just pick up the phone and give Dave a call. I am sure that if you got him on the phone and discussed the issue that he would take proper care of you and your problem. At this time of year, a lot of shops are pretty busy. Possibly he just isn't all that comfortable with email and maybe leaves it on the back burner to get to when he has more time. Who knows? Spend the few pennies and make the call.
I also question sending the unit all that way to begin with. You have a very respectable BMW trained technician much closer that always stands behind his work. Shail's Motorcycles has always done me right. He was factory trained on Airheads when they were new. Some of his mechanics were also trained that way. If he can't fix something, it just can't be fixed. His shop is in Langley BC, which is a whole lot closer. He has worked on all of my airheads over the years, starting back in 1979 when I bought my very first one.