Use carburetor cleaner instead of the PB blaster. It contains an acid that is there to eat away varnish and crap off of carbs and will penetrate faster. Take a small ball peen hammer after spraying the bolts, and smack them directly on the head of the bolt several times-straight in the direction that they are threaded in. This helps loosen the threads inside of the threaded hole. Then, use a breaker bar, 6 point socket and pull to loosen. If they still don't want to come lose, then try to tighten the bolt a tiny bit. Pull on it to loosen again and keep going-tighten and loosen, until it comes loose. A broken bolt is just as much pain in the ass as it sounds so do whatever you can to NOT break them.
Remember: When working on Subaru, learn two words very well-ANTI SEIZE ! !
Use it on EVERY bolt you ever put back in.