Should this timing chain be replaced? The timing chain is a KCM with "D6B" stamped into each link. The chain has about 12k miles on it and is about 12 years old.

[video:google]https://drive.google.com/open?id=0B47FH99TbpHuMkVDSm4yRTVHN2M&authuser=0[/video]