Help: Dead Uniden XS915 cordless phone

Hi, I did a bad thing, and dropped it into water. Half of the unit was
submerged and water did enter it. I pulled it apart and dried it out
for a few days by air, but it didn't work. I tried drying it out with a
hair drier, but it still doesn't work.

What it does do is turn on when you press talk and make the on beep
sound, but then turns off again after a few seconds as it will not
respond to any input other than the talk and end buttons.

Hoping someone may have come across this and resolved it, before I go
and by a new phone.

Regards,
Xygt