IMO, as usual, JBCurt you have it exactly right!
Red, you need to go straight to the bottom of the foam "block" and I would check in several places, both port and starboard sides of the boat. My foam was dry as dry can be on top, and it wasn't until the last 1" I found it to be totally soaked! I removed hundreds of pounds of water logged foam in my boat, hopefully yours is NOT this way, but do yourself a favor and check it thoroughly!
The method that JBCurt mentioned is a great one that will provide great results.
Frey