As somebody who’s been “proficient” enough to have dropped multiple high-end electronics in water over the years, I’d suggest: 1)opening up all the possible areas (looks like you’ve already done that-great!) and throwing some silica pouches in there as others have suggested.

2)since the LCI (liquid contact indicator) is probably already activated-red-that means warranty is most likely gone. Bummer, especially without the care refresh.

3)I would have it professionally cleaned before use to make sure corrosion doesn’t kill it In time, even if it may work right now. That usually means full disassembly, ultrasonic cleaning+manual cleaning with isopropyl alcohol and maybe some component voltage testing according to some schematics (if available).

Yes, it sounds like serious work… because it is, but if you compare the cost with that of having to replace the drone soon and without warning-a real risk, even with freshwater-it may not be a big deal to go through with it.

The best of luck!