seat remove recover

The Bennington boat cover has heated the vinyl on the seat tops causing them to become brittle and crack, according to the people who will repair the seat. I need to remove a seat at a time to have it repaired. This Tritoon has the aluminum undercover and I cannot see if the seats are through...

I am having the two from seat bottoms recovered this winter and the backs are due but cannot figure out how to get the seat backs off. Anyone ever removed their seat backs. 2002 207L