Anybody around belfast got testbook for td4 freelander

Having a problem with jacto auto gearbox in my 2002 freelander td4.
Harsh gear change from 2nd to 3rd and same wen goin back down from 3rd to 2nd and after changing gearbox oil and trying inhibitor and so on i think the problem is a failing line pressure solenoid valve but i need someone that has the testbook to see if anything shows up

Testbook is a Land Rover system protocol, so your nearest LR dealer will help. Or someone with a OBDII reader.