How to check for short cicuits in the internals?

I dropped my phone in a bucket of fresh water, and since the phone is 5 years old at this point so the VHB tape sealing the phone and making it watertight might've given way. The back cover is already disassembled and the internals are already exposed. The phone did not instantly turn off when it hit the water, it took about 10 seconds for it to switch off. Is there a possibility that there are short circuits in the electronics? If so can I use a multimeter to check it?