repotting time

Well, I have this JRP cascade that is sitting in this pot for too long. I got it two years ago, the original soil was a mix with mostly Akadama and now it is draining very badly. I guess there are two problems, the old packed Akadama + being root bound, so the needles are showing yellowing tips...

I am a recent transplant to the Portland area, and this being my first "real" winter since starting bonsai 20-something years ago. I had lived in San Francisco (where winter often came in July and August) and San Diego (where we never had winter at all), so repotting season started in late Jan...