Salt water in the phone. Any fix?

Hi guys!

I had a Google pixel 7 pro (256, Australia) which i dropped and broke the display. I then replaced that with a pixel 7 pro (128,India). I tried taking a few underwater pictures in the sea day before. The phone has gone wild since ( I switched off the phone and kept for 10-12 hours) . Now,it automatically turns on and off at times, phone gets too heated while charging, auto rotate doesn't work. Touch has become very sensitive.

Couple of questions: 1. Will this dry off and get fixed automatically? Or do I have to take it to a service centre? 2. If there is no fix, will changing the display of the old phone with the new one work? One is Indian version and other is Australian.

Thanks for the help :)