Thank you for your speedy replies as they are very educaitonal. A characteristic of the transmission now is that it quickly faults to limp mode during rain (which aligns with the connection suggestions) and when I get it out on the freeway (regardless of weather) it will remain in correct mode during the whole drive (up to three hours during last trip). I will bring all of this to the mechanics attention and suggest he misdiagnosed the symptoms from the beginning.