Down on d-pad dead after water damage

Water spilled onto my controller and I tried using it not knowing water had actually seeped inside. It pretty much just died after that. I opened it up and left it to dry. I then cleaned all the parts with a q-tip dipped in isopropyl alcohol. It seems to be working now with the exception of the down button on the d-pad. Is this fixable or am I pretty much out of luck here?