Options for repairing worn head unit knob

I have an Alpine CDA-9811 that's probably around three years old at this point. I'm pretty happy that it's lasted this long, and everything has been pretty bullet proof. But, it seems like the volume knob is getting excessive wear in it. It has a lot of play in it if you wiggle it around, and sometimes instead of going the direction I turn it, the head unit will read it as turning the other way. I think overall the knob itself is just getting worn out after years of being turned back and forth. Is this something I could send the faceplate into Alpine to have fixed? All it needs is a new knob unit soldered into the faceplate. It'd be even better if I could just buy the knob myself and not pay some inflated repair costs, but somehow I get the feeling that Alpine keeps any replacement knobs they have in a secret room somewhere below their headquarters in Los Angeles.

It's not a resistor in those, like in a regular two-knob head unit. It's a digital volume control - what's called a "rotary encoder", and there is no cleaning them. The knob and/or the encoder (probably the knob, based on tour description of the issues...) needs replacement, and it'll be worth it for you to send it out to Alpine for the repair.It all reminds me of something that Molière once said to Guy de Maupassant at a café in Vienna: "That's nice. You should write it down."

So I ordered the "KNOBROTALY ASSY" (PN 36B03242K01). I actually got two because they were $7 and I didn't want Alpine to discontinue it on me in the future. So what finally shows up in the package? Two shiny new volume knobs to slide onto my existing control. (How is it an considered an assembly when it's only one part!?) Anyone know the right PN? I have a feeling this will be very hard to find since it's a soldered part on the faceplate, and not detachable.'96 Mazda Miata

     In case you missed my earlier post this control is repairable, it is very simple and all items are available at a hardware store.

Sorry, I thought you meant repairable as in able to be replaced. You have a PM. Wait, never mind, your PM box is full.'96 Mazda Miata

   Or try this part number it is the right one    40T55277Y03 listed as the encoder for a 9813