First a filter and ATF change is NOT going to fix this and whoever told you that is talking rubbish. This box is fairly reliable but can suffer with alternator overcharging or non genuine spark plugs upsetting the gearbox computer. You say it creeps forwards in both forwards and reverse, so do you mean it doesn't actually go backwards and if so does it drive in Neutral? Is the tickover too fast? The fault on the pressure soleniod / circuit could be on the case connector. The excessive creeping and this circuit I'm fairly sure is not linked. The transmission can be checked independently of the vehicle computer with a TranX 2000 It can be driven with this on and pressure can be altered etc. as it going. Check out www.fedauto.co.uk for specialist in your area.
mags
June 2010