Sorry for you... and me, Happened the same thing to me just a few hours ago. I took my car yesterday for an oil change, this morning there was a pool of oil on the garage floor opened the hood and found the oil filter O ring sticking out from the filter (too tight). Ok, they send a flat bed put an new O ring and washed the engine compartment, I asked them to reset the FSS (didn't do it yesterday). And I think that there where the problem started, when I got home from the shop it was dark and then I noticed that when turned off the lights and the car, took out the key the backlight of the odometer and the FSS stayed on.

I think it has to be something with the steps for resetting the FSS system, this is my second oil change the first shop could not reset the damn thing had to do it myself (have the service manual) that was what made me go to another shop and I think they don't know how to do it too.

I'm going to mess with the buttons tomorrow, if I fix it I will let you know but if you already fixed yours PLEASE let me know.