...another feedback here... Drove arround 500 KM with the new TCU, 1 - 2 ; 2 - 3 UP still bumps, 3 - OD is great, downshifts are all fine, no shuddering or bumps while carefully tip on the throttle on 2 - 1 ; 3 - 2 anymore. Lockup is gone (Code 38), you hear the pump if you listen carefully, a really high, quiet noise comming from the trans. (Since i got the vehicle, 4 years now) Fluid level is fine, also the condition of the oil. So i guess the pump is just worn out or some seals have failed in the last years... BUT, TCU definatly fixed some known problems, i also found a NOS rebuilt unit for my minivan, it´s got a new trans, so a new software isn´t bad at all.