Well, if you haven't looked at patch kits you might want to give it a go before a full replacement, unless it's got other issues.
The kit I have (and I'm sorry but it's not in front of me right now, but it's a blue box) has a roll of semiclear plastic material about 4 inches wide. You dab on the glue, fold it in half, don your facemask or goggles and dive down and stick it on.

HTH

C.