'98 Outback Transom repair/ restoration

[98Roo]

So I noticed a had a couple soft spots on the swim platform and also noticed it would drip water out of a few places thru the fiberglass/paint for a few days on the trailer. Would run out even more if I took it off and set it upright and pushed on a few places. After probing with a small screwdriver I figured out it was soaked on the inside....So I started tearing into it thinking I could just replace the rot with new wood, but ended up tearing it all out. It was wet in places almost all the way to the middle of the platform.

In the process I found it was balsa cored which lead me to realize what the FLOOR OF THE BOAT is made out of. BALSA sandwiched in fiberglass.. So much for "wood free." I guess if you don't consider balsa to be wood then yes.
It was easy to get the wet stuff out but the stuff that was completely dry was pretty tough to get up. Just used a Dremel to cut small squares and chiseled them out.