I've not worked on a Classe, but many CD players have an electronic adjustment process that should be completed when a laser pickup is replaced.
If it is skipping on tracks that it should read after a factory authorized service, the far and away best thing to do is return it for a second look. They've got the equipment, manuals and training. Just be specific about the problem you are having. Since it is just a few CDs that are having problems, give the repair shop examples by name. (This assumes you've checked the CDs for scratches and smearing and/or ascertained they play OK on other machines.)
If it is skipping on tracks that it should read after a factory authorized service, the far and away best thing to do is return it for a second look. They've got the equipment, manuals and training. Just be specific about the problem you are having. Since it is just a few CDs that are having problems, give the repair shop examples by name. (This assumes you've checked the CDs for scratches and smearing and/or ascertained they play OK on other machines.)