kayak air bladder

I have a Stearns K1 116 inflatable kayak. It loses air and I think the air valves do not seal completely—not sure. I also cannot unzip the bladder cover to remove the bladder to inspect it for leaks—how do I disconnect the zipper to remove the bladder?


stuck zipper?
Is the zipper corroded?

May have found the leak
usually, zippers stick because something is caught on them. If it isn’t corroded, it is possible the bladder was pinched in the zipper. That’s where I’d look first, in any case.