Hi and welcome to FixYa,
Initially, pls try a disc cleaner. It would appear to be like an ordinary CD or DVD disc but with a small brush like protrusion. It would be something like below.
To use it, play it like a regular DVD or CD. All it requires is to spin inside the Integra CDC-3.1 to clean the laser/lens. It should be readily available from most audio/video stores and even computer shops.
Pls post back for any updates/developments.
Good luck and Thank you for using FixYa. Happy Holidays.