== "Water" ==
could be condensation. Leave that box in the car (or other unheated space) travel in and out of AC often and you could see "water" issues develop. Moisture indicators have been reported to change colors due to high humidity, not actual liquid spills.
Pull the top case and examine the logic board closely for beginnings of corrosion (discoloration) on the logic board components.
If you find some you should decide if its' severe enough to require replacing the board or if you merely need clean it. Cleaning takes time, but costs less than installing a new LB.
'''Carefully remove the board''' so you can check and clean both sides ''(before you start know how to disconnect the sensors and ribbon cables so you don't damage your board by breaking them)'' then clean both sides with a soft brush and some residue free electrical contact cleaner.
You can search for "logic board clean" and find more advice about how to accomplish this.
''If this answer was helpful please remember to mark it accepted.'''
Good Luck,
N.