the soft wood is outside the corner of the shower stall and right at the wall behind the toilet. The only part I saw affected was right in the corner at the wall, and a quick check under the house proves this out. However, I'm not sure yet if the rot runs under the bathroom wall line. AS I said, it's a very small area of damage,luckily, and fairly sure it's caused by splashing out shower door. No leaks found anywhere, so I guess I'm better off than most. I guess I'd better get it fixed. Thanks folks.