Lucanus Ollivierre you are the one with the equipment. iFixit would have to try and get one first. Then spend more time and money in taking it apart and trying to figure it all out. iFixit really can't do teardowns on every device out there. I am sure they would like to, but that is why they have this great community.
Now, lets get back to your water immersed camera. You said the beach. I assume that means saltwater. Hm, more corrosion due to the caustic nature of that. I also assume that your camera is a Canon EOS Rebel SL2/EOS 200D. I would suggest that you combine something like this video and the guides from here Canon DSLR Repair I'd be looking at the 7D,70D and the 500D. Take your time and always remove things carefully. Check for hidden screws and ribbon cables. Take lots of pictures about this. Once you got all of this done, clean your boards, cables and all connectors according to this guide Repairing iPhone Liquid Damage Yes, it was written for an Apple iPhone, but all the point are still pertinent to your camera as well. Of course, if you have access to an ultrasonic cleaner, that would be best. Anyhow, while you clean it, check for missing and damaged looking components. Post a couple of good pictures with your Question. Adding images to an existing question That way we can see what you see and hopefully assist you in getting this fixed. Now with all those pictures that you took, go ahead and be a Pathfinder and create a guide. That way the next person that has issues with their camera, will have a great guide. It's easy, it's fun and the community will appreciate it. https://www.ifixit.com/Guide/new You got this!