there is a lag while shifting from first to second gear, the problem is most likely caused by a solenoid that is sticking or that is dirty. the fluid was checked and found to be recently replaced (which also could be the problem)… it happens while shifting from first to second, or second down to first… but all other gears shifted smoothly.
We also plugged in out scan tool, and found no Transmission codes. so this supports the theory that this might very well be a mechanical problem.
And I thought I was the sensible one. Thanks for setting me stiarght.