Well there I was, on the Ducati, going for it through the Perth hills near Gidgegannup, braking into a fast right hander, lots of front, a dab of rear to steady her head, a down change.....err what the f*ck!...NO down change!....lots more front brake, panicky counter shove on the bars, just made it with about four inches between the front tyre and the pea gravel. After regaining my composure I checked out the gearbox. I found that while I could change up ok, down changes had been almost completely deleted from the gearbox. I discovered that if I waited long enough, (maybe 30 seconds between tries) I could eventually change down one gear at a time about every 4 or 5 attempts. After the long limp home I set about figuring out the problem, and started with the idea that I had somehow bent the selector fork. I didn't really want to dive straight into dismantling the gearbox though, so I started the normal process of elimination, beginning with the clutch. Was it disengaging fully? I checked the basics, like fluid and lever throw, and they seemed ok, so I decided to bleed it just in case. One hour and a lot of brake fluid later I proved conclusively that there was nothing wrong with the clutch, and I had just wasted an hour. Next idea was the rear-set linkage, (anything to avoid thinking bent selector fork), I checked the adjustment and throw, and all was well, so back to the drawing board. So far I had spent around two hours on the job and was no closer to a solution, the bent selector fork was looking more likely by the minute. Next idea was to change the oil, as I hadn't done so since I got the bike. Another hour and a half later later, after driving to get some oil, draining and refilling, and an abortive test ride, I sat on my toolbox beside the bike and finally accepted that the gearbox would have to come apart, and being a Ducati that was going to be a can of very expensive worms. I decided that I had had enough for the day, and started to put the cover on as soon as she cooled down, when suddenly I heard a tiny 'click', and saw the gearchange move very slightly from the corner of my peripheral vision. On investigation I found that when depressed and released, the gearchange appeared to return all the way, but was in fact stopping about 2mm early. I applied some spray liquid grease to the pivot, and worked the pedal a few times until it returned that last 2mm, and heart in my mouth went for a ride........bliss, absolute bliss, not only was the problem gone, but the changes were quicker and smoother than before. So several hours of wasted time, and a lot of worry later, it proved to be just a slightly sticking gearchange pedal that was not returning fully enough to disengage between changes. I was not a case of not being able to make the next change, but of actually finishing the previous one just two measly mm short of full disengagement. Now I have never had this before in 40 years of riding, so if this helps anybody else avoid the hassle I had, then I won't feel those hours were totally wasted. Keep those gearchange pivots lubed boys and girls, and don't waste a perfectly good afternoon like I did.