A lot of dealer/factory trained mechanics leave the dealer after 10-15 years and open their own shops, so they typically know the older models better than current dealer mechanics, and those older models are probably the majority of their busines.

I'm lucky to have one only one and a half miles from me who can do jobs I'm no longer willing to do.

A good shop forman should be able to recommend a local independent who knows your older model better than his current shop mechanics, so just ask.

Duke