Crown Aviation at KPAE is recommended
They have been recommended to me, and did a little work on my transponder last week. Last week, I decided to take my plane to them after twice getting tower reports about my transponder signal. I figured I'd end up buying a new altitude encoder. Turns out, there was an AD from 1996 on the transponder resistor network, and Crown replaced it under warranty. I had fully expected to pay, but I got out of their shop for free!
While I was there, I ran into an A&P I used to work with down at Boeing, Andy. Andy is a good guy, and he seems happy working at Crown.
I recommend them.