Just to resolve this for future 968 historians, I have ameliorated the turn signal problem. Turns out, in my infinite genius at some point (likely when replacing bulbs) I plugged the fog lamp into the turn signal socket and the turn signal into the fog lamp socket. On both sides! I switched them back and now all is well.
For the third brake light, as I think I mentioned on another thread, the only replacement bulbs that worked for me were those ordered directly from Porsche at 5$ a peice. I cleaned all the contacts by soaking the whole socket in salt/vinegar then baking soda/water and scraping the contacts with a tiny wire brush, now the third brake light shines again.