Re your left jog.. I had a problem with the right jog (sounds simular to your's) where the pitch bend would work , but when in scratch mode , it would barely respond to touch and when it did, it lagged and hesitated - basically it was useless.
Here is what i did to get it working 100%
-lubed the shaft (where the finger/touch sensor wire) makes contact with some Deoxit as well as lightly .. and i mean lightly , blew out anything that might have been on the optical reader / eye where the disc passes through. These two things seems to have did it.
Now , before doing that i was playing with the sensitivity pots in the back. I went from min to max in very small increments until I broke the pot.. whoops! I now have stronger onces installed.
Also, these are seriously SIMPLE inside .. swap things around such as optical reader .
That is my best advise.
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