I listen very carefully to the sounds of the motors and when there is a diffrent sound on one i open the phantom and put a drop of machine oil on both sides. After this it flies smoothly again . I have a phantom 2 that was 10 minutes in the water. The next day i was flying again. I made it dry with a hair dryer. Opened even the flight controller to dry it. Oiled the motors and i am flying still! Only the battery was burned the next day, it even made a black spot on my table where i left i to dry. Now i practice with the phantom who was in the water and take video and pictures with my vision plus. I opened the plane so many times, i can do it with my eyes closed now
