Yes FourWinns will cover the spring as long as you are still within your 2 year warranty.
But to be honest with you if that is the only thing wrong with your boat you might want to check the price of the spring before bring the boat in or even if you just bring the "part only" in for warranty if you end up doing it your self for the dealer, Because if the boat is older then one year you may have a $50.00 warranty deductible and the part may not cost you that much to just buy one your self and install it your self, And for the dealer labor is only .5 an hour max, So over all it could cost you more money in the long run if your not careful here and have it done by the dealer. I think the spring is around $20.00-$30.00 if i remember right.
Also just be sure you always
push the center of the spring back before closing the hatch to try to prevent that from happening. Good luck.