My MY05 died whilst driving last week, then wouldn't start back up. The keypad would (sometimes) let me put my code in, then the yellow engine light would come on to say i could start my car, however you couldnt hear the fuel pump priming.

Turns out the brant was faulty and not giving any power to the fuel pump.

I did a search on rexnet, there are plenty of DIY fixes available. I preferred to get to towed to Subaru and let them sort it out. They just replaced the whole unit. ~$400

Although my symptoms arent exactly the same as yours, i found that most of these issues are caused by the brant.

Did you receive a recall for your car? I'm not sure exactly which build date was recalled, but a number of them were (including mine), for a grounding issue with the immobilizer that was causing the car to stop and not start, etc. -You never know, it might be that issue, which if it is, you'll get repaired for free!