I have posted this same issue in benzworld.org, and wanted to post here as well to get more information for my next steps.
The issue is that the left inboard guide broke off and the broken piece has fallen at the bottom of timing case. I tried fishing it out using a pickup tool and can get a grab at it but will not pass through the gears as there is no room. A couple of pictures are attached for reference. One shows the broken guide. The other shows where the broken piece has fallen to.
My plan is to try and fish it out from the driver's side. Using a USB endoscope for visual, a pickup tool and a locking clamp, hopefully I can get this done.
Pls let me know your thoughts. Also, looking for a picture on the inside cavity of the timing case for a better understanding on how the broken piece might get caught in the timing chain and cause a big problem.