OK having had a mast which has been very water tight, the last two capsizes have ended up with water in the mast and not being able to self right, the first time I got caught in ropes and halyards on the wrong side of the hulls, ended up totally turtled for the first time, on Sunday however it was just a tip over with spinnaker up.

My question is then, what is the best method for finding out where the leaks are ?