I just had my MD back from Sweden where I got +drive, a new data wheel and all new encoders..the jog wheel was pretty annoying so definately wanted that changed and some of the encoders were beginning to go slightly jumpy like yours so I thought whilst it's in Sweden get it done..
Unfortunately the journey back for the MD must have been ardous as it came back with the led's above the data wheel recessed into the MD (fallen down inside and 1 is wonky)..looks like I'm going to have to open her up!