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Hi my name is Robert.....
Have you looked in back of the breaker/fuse panel inside? Sometimes you will find a ground bar with all the grounds screwed to it behind the fuse panel or near the power converter. I am not sure on your model where your power converter is it may be part of the main fuse/breaker panel OR stand alone and plug into an outlet. I would look in those two areas. Has the electrician tried to run a separate ground for that circuit? IF you have DC power at the switch I might run a new ground for testing and see if the problem is from the fuse panel to the switch. I would also check all the connections at each light and make sure they are good if that also has not be done. Also the electrician should be able to ohm out the ground wire from point A to point B and see where the problem is. I do not have a diagram or I would give it to you..... Robert