That's probably a good list of dealers not to go back to. That's like a mechanic saying, "Huh, I can't figure out where the coil packs and spark plugs go." Granted ,there could be a timing chain...but it's a pretty small displacement engine for a chain.
Agreed with Geordi as good resource. There are also LOTS of people that have done it themselves (with good write-ups to be found here). Alternatively, a good diesel shop local do you, or even one that works on VW TDIs might be a good way to go. Many of the tools and even a couple parts are common between the VW TDI and VM designs.
Dan
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2005 Silver CRD Limited

245/75R16 GoodYear Duratracs
Fumoto drain | ProVent CCV Filter
Stanadyne FM100 filter | Cummins fuel pump
GDE Eco | SEGR | BoulderBars | FrankenLift | Frankenskids