Whats wrong with my Minelab Excal?

So its been a while since ive posted, ive just been to busy with school and work. Anyways i suited up and went into the cold water yesterday. Was only in for a minute untill my excal freaked out and started giving me a constant and very loud deep signal. I took it out of the water. Turned it on and off and the problem persisted. From what ive read I think its a a bad coil. Maybe water go into it. I looked at the bottom of the coil and it looks liek the walls of the coil around the edges has seperated from the rest of the coil a little bit. Does this sound like a coil problem? The only other thing that i can think of is that the other day i accidentally over charged it and left it plugged in for 24 hours. w00ps! but i dont think that is the prob. can anyone lend some suggestions? thanks guys

HH