After being 8' underwater for 20 minutes my P3A flies just fine.  Dried out, got the lens clear and it seems ok.  Except the gimbal has intermittant shakes when filming.  I tried it on my desk and I can see the gimbal motors cause a vibration as I tilt the drone in various directions, not just one.  Any ideas on a quick fix, other than gimbal calibration which I already did.  Or do I need to send it to DJI for a $250 fix?

Hi. I am sorry to know what happened to your DJI Phantom 3 Advance. Since this issue happened to your Drone. The best thing you need to do is to send the Drone in for further assessment and for repair. I will be posting the DJI online repair request link for you to create a ticket for your Drone. Thank you.
www.dji.com/support

Electronics will corrode over time after getting wet  It will probably get worse.

I by no means am a pro or anything, but i am really surprised it works at all.