Yeah...I know they aren't in business anymore. Sometimes when I try to change frequencies the knob turns but the number doesn't change or it changes two numbers instead of just one. I eventually get it to the frequency I want but it takes a few more seconds. These radios will be changed eventually to something newer probably Trig or VAL. My question is, is this just something that needs to be cleaned and can any avionics shop do it? Or is this thing just wearing out?