hard to say, especially since I don't know your floor plan....
water leaks can travel and can be very hard to pin down.
Just shooting from the hip..... you say rear corner.... so
slide seals?
rear clearance lights
tail light... (I don't know if these same lights that have the common issue were used back in 2010, but something to check)
BUT if it's not a slide issue, my bet is someplace up on the roof...at the edge of the membrane.
and you said silicone. If you have silicone caulk up on the roof, that's probably it.....but it's probably not silicone.
__________________
|