I've just fitted the Eutronix illuminated buttons kit to my MK2a. Now my volume knob is jumpy!

I very very occasionally used to experience a problem with the volume knob, but it was very rare.

I guess I could have fried something during the upgrade - I do have a proper ESD field station which was connected to me and to the soldering iron ground point. The iron was set to 500 degrees F. The illumination seems to work as expected and the knob has problems even with illumination turned off in Hijack (not easy to do now!). The knob problem is most noticeable in the Hijack menu.

I really hope it isn't the encoder - I superglued the knob board to the encoder

I'll try some switch contact cleaner if I can get the nozzle anywhere near an opening. Any other suggestions?