hello all.a little more on the ongoing saga of the stva problem I had. after much research and scouring the tinterweb ,I found a few posts and videos that have enabled me to take the actuator apart and resolder the dry joints inside.what a result!! saved myself £700 quids and bike is running like a sewing machine.I am one very happy little fella! I also found on the e-bay,a bloke selling a digital service manual .absolute bargain.if anyone is interested,the item number is 253922388766.