Yes, I just did a search, and the FSR did come up as a likely culprit. Are there any symptoms when the FSR goes bad and starts drawing huge amounts of current when the car is off? For example, does the fan run on its own? Or does is sometimes go bad without giving any symptoms? Is there any way to test it, in other words? Does anyone know offhand which fuse's circuit it's in? I assume if I pull this fuse, and the leak stops, that would be a pretty sure way to confirm the FSR was at fault, right?

Edit: My apologies for not doing a search before posting this question, as there are tons of threads dealing with battery drains on these cars. I found that fuse 64 controls the FSR, and that another common cause of large drains if the Telephone Control Unit (TCU), which is fuse 74. Hopefully, it's one of those.

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2003 X5 4.4i
1992 Porsche 968
2007 328i
2014 Subaru Forester XT