[Elecraft] K3 #9 button

[W9HAK]

My number 9 button takes a firm push to get the number 9. A tap for 
notch seldom works, and if it does it takes many taps to clear the 
notch. K3 serial number 3953 was assembled in the 1st quarter of 2010.

By the time I learned enough to use the notch filter it had been in 
service for some time. Everything else works great with the exception of 
the "tap 9 for notch filter". Any ideas on how I should solve this issue?

Smith Bradford
W9HAK