Could it be like the rear suspension and you must not tighten any of the control arm suspension bushings until the weight of the car is upon them? If so it would be 4 bolts to loosen/retighten. AND if its that simple I'd politely ask for another tech at the dealership to work on it.

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Hanno
'79 6.9 Sold (after 27 years)
'83 280SL, 5 spd.
'94 E320 Sdn. 5 spd conversion
'02 E320 Sdn.(on loan to mom!)
'87 300E (5 spd. conversion) Sold
'05 E500 Wagon