[Elecraft] Erratic tuning on K2

[skavanagh72 at yahoo.ca]

One of my K2's has developed a problem where it is (somewhat intermittently) unresponsive to turning the tuning knob.  Turning the knob may or may not, at different times, cause the radio to change frequency.  Pushing on the case/panels and tapping the tuning knob sometimes seem to help, so I am suspicious of the board-mating connectors and solder joints for the encoder. This happens regardless of tuning step size or VFO A/B choice and does not affect the RIT.

A few questions before I tear into it:

Do the encoders ever wear out?

Has this happened to others, and if so, what have the fixes involved?

This K2 has seen a lot of use in the field and mobile as well as at home so humidity- or vibration/shock-induced problems are quite possible.

73,
Steve VE3SMA