Hi there guys and gals

Ive got a Volvo S60 T5 2002 model. I send my car in for repairs on my crank seals, after the oil leaks was sorted out first test drive of the car was good except 3de gear didn't want to engage, when i left my car there i had no gearbox problems and the car was never driven whiles it was at the mechanic, i was the first to drive it. I did some research and found a post on the forum explaining about the problems with the wrong ATF, i drained all the ATF and replaced it with MOBIL 3309 still i had the same problem, i would like to know if its the valve body that's broken or dirty or will it be fixed just by doing a gearbox "Flush" or if its an electrical problem.