tc1100 jog dial partially working May,2012

My trusty old tc1100 jog dial works partially, and I need it to function completely as I have a grub menu on boot up and need to select between windows and linux. the problem is that the jog dial click works, but page up and page down is not functioning. This indicates hardware problem is more than likely. I need to identify if it is the contacts or something else. Any hints?
tc1100 jog dial partially working
f5 parts needed. May,2012

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