Ok as ErikG mentioned your board is indeed a chinese made with a sandwich construction fiberglass with epoxy + sheet of "paper" or whatever material it might be + fiberglass with epoxy again, over the EPS foam core. On the deck a super fin sheet of bamboo is inserted between outside layer of fiberglass and the nameless middle sheet. On your photos the outside layer of fiberglass is definitely cracked, how deep it's hard to say (press on it or let it hang in a warm place cracked face down, see if water drops appear - an other old trick is to suck on the crack, does not always work however). The problem with most EPS is it has a shitty tendency to suck on water (even though the "pearls" composing it are sealed), so if it was my board I would definitely have it repaired by removing the cracked material (sanding out the damaged fiberglass, if middle layer damaged too spackle it with a filler or batch of microballoons with epoxy) and putting a new patch of fiberglass with epoxy on top. This can only be done if the board is dry, and remember epoxy resin works/dries best in good 20 degrees temperature and for 24 hours...
Just my 2 cents, anyone with a better expertise feel free to correct me
