You can try emailing the parts connexion. The people who designed the transport 3 are there. Best of luck.
The advice from Jjh1425 is good advice. The problem you describe is not unknown in Philips transports. It happened to me with an Audio Research CD-2 with the Philips 12.4 transport. I took it to my local AR dealer for service. He said that technically the laser was within official spec's--somewhat marginal--but still within spec's. I told him I wanted a new laser anyway, even thought the machine would play 99% of my CD collection 100% of the time. He installed a new laser and the problem was cured. I think that the player even sounded better on all discs after than; but this could be psychological.
These kinds of problems are very frustrating! Good luck!!