Does my click wheel need to be replaced?

I am wondering if anyone can tell me if I need to replace the click wheel on my iPod Classic 5th generation or if I need to replace the logic board.

Here is a list of the steps I'be taken to trouble shoot:

-Reset the iPod (the click wheel allows me to do this sometimes)

-Restored the iPod

-Left it face down without use for about week in case it has taken in moisture

-Opened the iPod and disconnected everything to make sure all the connections were correct and clean

I did notice a small amount of corrosion near the click wheel connection on the logic board which I why am looking for advice on what the issue might be. The iPod works great synced to my car and will turn in but I am unable to select or scroll.

Any help would greatly appreciated!