Hi and welcome to the forum.
Yes being outside the Fairphone area is a pain.
Not sure if will help but you may want to try drying more
I opened it all up right away and dried it very good, it seemed good, only a tiny pinch of red on the water damage marker inside the phone.
Did you dismantle the modules? Water or more precisely dampness can get into the modules let alone contaminate and help corrosion of the contacts?
You may like to read up on [water, damage] etc. here on the forum, there are a lot . . .