I replaced my PS2 laser because it had problems reading DVDs but after running the lens changer program 4 TIMES it still has the same problem, the only thing I could think
PlayStation 2 Slimline PVR-802W Laser Replacement - iFixit Repair Guide
Playstation 2 (fat): Laser cleaning and / or replacement - Dreamcast.nu
Amazon.com: PVR-802W PS2 Laser Replacement Lens - TECTINTER Compatible with PS2 Slim Console Repair Part Replacement,70000 Series/90000 Series/77000Series/79000Series,NOT for 75000Series : Video Games