[Elecraft] Question, regarding optical sensors used in K3

[Dave Cole]

Hi,

I had an occurrence where one of my smaller knobs, (Filter Width), 
became erratic in its control of the actual filter width...  Skipping, 
and not having any effect at all...

I fussed with it a bit, and now it is working...  Is this a sign of 
imminent failure or is it just a bot of dirt?  Any way to tell?

-- 
73, and thanks,
Dave (NK7Z)
https://www.nk7z.net
ARRL Technical Specialist
ARRL Volunteer Examiner
ARRL Asst. Director, NW Division, Technical Resources