Seat heating def.

After 3 workshop repairs I give up. Also the Opelwerkstatt and Boschdienst are overburdened with the technology. They come only until the diagnosis then to determine that both seat mats are def.. They do not come up with the idea that they have to locate the interruption with a measuring instrument and a schematic. This “defect search” is then calculated with 147€. New mats order and make themselves to the repair, they also do not trust themselves, because they do not know at all where the F The diagnosis does not say exactly where the interruption is. It is to despair. Does someone have similar experiences here in the forum?