Sounds like something relatively minor to me.
The bike did whatever it could do. It lit the MIL light, and if you knew the indicator sequence for the light, it might have told you what the fault was.
Not that you could fix it on the road, anyway, but it might have told you where the fault was.
Thankfully, the warrantee is in place, and this type of thing is exactly why they have warrantees.
I hope you get the bike back soon.
Theoretically, if the dealer knows the MIL sequence, and has a part on hand, he should be able to get it right back on the road in no time.