Hi Dave - I'm not a repair shop, but if you don't find a proper shop, I could take a look. I'm in Van Nuys, so pretty close to you.
I fixed the two d8bs I'm using, and have a spare 3rd unit I bought for parts, but was easy to fix (battery) - so I have 3 working units now... plus a 4th computer unit with a bad mainboard, but all the other parts working, so I'd likely have whatever yours needs.
Just send me a personal message if you'd want me to give it a shot, and we'll work something out.