Just make sure you have your headphones and coil seated really well and make sure the O-Ring is lubed up and grit free. I use just a little bit of dialectic grease directly on the O-Ring.
Aside from that you can check the coil,housing and faceplate really well for any cracks that may have gone through the plastic all the way. If you have a coil protector on it, excellent, but if not, it's ok. I don't use one ever. Actually, it's not OK per say, but it is. They are like $12 maybe? You will find that in 3 days. It's an expensive fix for something easily avoided.
Give Garrett a call and see if it is in or out of warranty. They will have no problem looking it up for you.
That's the best I've got for ya. Best you can do is dunk it and hope for the best.