Ok, I have a couple of days off starting on Thursday so I want to fix an issue with the 83 300D. The locks! Everything else vacuum operated works ok (Engine Shutoff, brakes, transmission ) So, where would be a good place to start and a logical progression?

I have read most of the troubleshooting posts and I have the vacuum diagrams and a decent hand held vacuum pump, I just need some input on where to start eliminating stuff.

Thanks.

Glenn

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2012 Mercedes ML350 Bluetec 91K (hers)
2005 Corvette 55K (fun car)
2002 VW Jetta TDI 231K (mine)
1998 Volvo S70 T5 Turbo 196K (kids)
1994 Ford F150 4WD 249K (firewood hauler)
1983 Mercedes 300D 376K (diesel commuter)