Fwiw, I think that is the least that Yamaha should do. Business is business, though. I bet the bean counters checked the cost of removing engines, stripping them, replacing the gearboxes and re-assembling everything.

Probably cheaper to bolt in an engine. But possibly much better PR for the affected customers, too. I think that, for whatever reasons, they are doing the right thing here.

Also very happy for you, Norwegian Mule, that you have an oily gearbox. Nice.
Like you, after I picked up my Tenere from the dealer I had to do the spanner thing. But a few months ago a random bolt flipped into my lap at 110km/h. I found that it had departed from the top left triple clamp, and the other one was really loose. Seems my quality control can be a bit crap, too!