Welcom to the site FC! Here are some answers to your questions:
1] Does this boat have any wood in the hull or transom?
Answer: Yes, the transom is wood, and so is most of the deck core. See if you can "bounce" the motor on the transom - if the transom flexes, it's time to recore. Check for soft spots in the deck - it may be solid, but if you find soft spots, a redeck is in the future.
2] If the foam needed to be replaced in the stringers could it be done through the gas tank access or would the floor have to be cut out?
Answer: No you would have to take the deck out - but you can check the condition of the strigers through some access ports - depending on use and storage, the foam might be fine...
Hope this helps - see ya on the water!