You should check what audio tracks are giving the CD drive trouble. If only the early tracks or only the farthest to the end of the CD tracks glitch out then I'd slightly adjust VR101 first. The direction to turn it would be based on which tracks are causing the issue.
If nothing is reading well at all no matter what track I'd try turning the VR102 counter clockwise slightly.
Also, never hurts to clean off the CD lens with some rubbing alcohol and a Q-tip
The lens could have just gotten some dirt on it during shipment.