Ha Nobitchin
The West Systems manual is a good place to start. This is a sight to it but if I can remember correctly that have a section in the regular paper manual about doing decks.
http://www.westsystem.com/frames/tier1/usingepoxy.htm
http://www.westsystem.com/ewmag/19/Replacing_Core.html
You could do a search on this sight about replacing decks and look at some of the boat projects under galleries as well. The method I used and probably the best for you problem since you are not wanting to raise the deck just fix soft spots is to remove the top layer of deck fiberglass, remove the core material, replace the core material, and then replace or put back the old deck fiberglass lamination.
FellowShip
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Just for the Grins