Marantz 6000 Problem

[Sabas]

I have changed the laser of a marantz 6000. The CD player had begun to have reading problems. The CD to player lost a little in the reading.

With the change of the laser the player sounds better. But the player now loses more and has more errors. The player has errors in cold. I have observed that when the player warms, the player work better.

Questions:

It is necessary adjust the new laser?

The failure could be another one?

Sometimes I have read that there is to change a capacitor that is had broken and is the cause of the failure?

Thanks