hi all, I was innocently trying to replace a couple of windows when i noticed a "lump" in the cork floor that the PO had installed. i cut out some of the cork and found two spots of "floor hay". the damage isn't horrible, it stops shy of going the whole way through but I am trying to determine whether this type of damage happens "top down" or not. do i need to worry more about what i can see that's on top or what may be beneath it? seems logical that if the top is rotted and the bottom of the subfloor is not it's a top down thing but I have no idea. there is an identical spot on the other side - both are approximately where the front end cap is riveted onto the next piece. anyone seen this? I'm completely clueless. the real question is - where is the leak? is it old, is it new? i've been in there in torrential downpours and not seen anything but... how do i find the leak? I'm well into a bottle of wine to soothe my pain