This is going to sound stupid but....
I've had a YB for a while now, and considering it's a 91, it needed a lot of work. I got it running, and sorted the major problems, and set to work on the little things. It's been inside for a few weeks now while I fiddled with the electrics (and she doesn't like the cold). I can't seem to get it into neutral, at all. I can go all the way up, all the way down, forwards, backwards and sideways, gentley, softly, while whispering sweet nothings to it and it seems to have vanished.
Oh dear.
Any ideas?