G9 ISO settings not quite functional

I have a G9 that got quite wet some time ago. I removed the battery and dried out the camera thoroughly before turning it on a few days later, and all seemed to work fine. Until I noticed that the ISO settings don't quite work right.

The ISO according to the dial and the ISO do not correspond to the actual ISO according to the LCD:

DIAL / LCD
HI / AUTO
80 / 1600
100 / 800
200 / 400
400 / AUTO
800 / 400
1600 / 1600
AUTO / AUTO

So basically, I can only shoot at ISO 400, 800, 1600, and AUTO. Which is actually quite useless to me, since I primarily shoot at ISO 100 and 200.

I'm sure I fried something when the camera got wet. The question is, what did I fry, and how much would it cost to repair? Not sure I want to bother sending it to Canon if it'll cost too much.

Anyone have any ideas as to what might be wrong and how much it'll cost to repair?