Emu XL-7 & MP-7 User's Group

O.K. I love my XL7 but at the moment I'm only using it as a sound
module and with presets (except what can be programmed via the knobs)
mostly because the jog wheel has become totally useless and I've
switched to using Ableton Live as a sequencer for my studio.  

But back to the XL7 If I'm trying to adjust a parameter lower (say
tempo) I'll slowly turn the jog wheel counter clockwise the value may
go down a bit but soon it's going up rather than down, then suddenly
it jumps to its max value.  

Is this a common problem?  Any suggestions on how to fix this?

Can it be fixed with just cleaning the jog wheel area?  I've also been
thinking about sending it to a tech.  (I'll ask at my Local music
store)  Another option is getting a  MP7 and swapping out the board
with the jog wheel on it.  This has the avantage of adding the MP's
ROM.  Or maybe any of the command stations if sold without ROMs (I've
seen this on ebay on occasion) which would hopefully be cheaper, and
using the rest for parts (if/when they go on mine).  I figure I can
swap out the board with little problem if I have to.

any experienced with this or other suggestions would be appreciated.