Well it had too happen my Javelin ( Old faithful), sitting there saying "investigate" my Trackball issue. Normally, and I recommend you follow the dismantle instructional videos, you basically unscrew the Body from the rear. But if your careful, and I mean careful, there's another way. I prised off the keyboard and you can just remove the Trackball/sensor assembly. I cleaned the Trackball and refitted it, no change. Looks like I will replace the Trackball and sensor, at a later date. All flex cables connections seem ok must be the TB and sensor assembly. I believe you can buy these parts online, as service parts about $35USD Ill keep you posted