Previous owner claims transmission was rebuild by Lee Miles transmission shop with OEM MB parts last year. Transmission engages harsh from P to D and soft from P to R. It slips or flares when upshifting into 4th gear when cold. When warm 2nd to 3rd shift feels firmer than 3rd to 4th shift. And I also hear howling sound in N and when accelerating. When I release gas and just roll howling noise goes away. It seems like transmission either was never rebuild (they just tweeked modulator pressure) or rebuild poorly. What do you guys think? Is there anything I can check? Or shall I take car back to a shop and what do I tell them? K2 clutch is slipping? Pressure incorrect? Bad front pump?
Car is 92 500sel with 150k ml.
Thank you

__________________
1999 ML430 Silver 135k ml
Smoked LED taillights, Alpine in-dash DVD player, 12" sub, Pioneer components, 2 amps, 4200k HIDs, ML55 headlights, 20" rims, mirror LED blinkers

SOLD. 1996 E320 145k ml. Burgundy

SOLD but miss it everyday 1992 500sel Black
Chime buzzer mod,Alpine CD/MP3 player with stock amp,Euro headlights,S600 grill,20" rims, BEST CAR EVER!

SOLD. 1990 300E White
187k ml,smoked tails,Euro headlights,17rims,Intake,12" sub in first aid kit,alarm/autostart,buzzer mod