I sure hope someone chimes in about the seat heater, I also have the same problem - back heats, bottom doesn't. Dealer said I need a new seat at something like $1100-1300, don't really remember because i had no intention of doing it, at least then. Based on some other things, I had the feeling they either didn't really look at it or didn't know what to do, so they just say replace the whole thing. They may be right, I hope not.

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2002 E320 4-Matic
2008 Subaru Outback
2009 Subaru Forester