GMC Sierra parking brake light stays on

Update:

Took the truck to one of our local GM garages two weeks ago. Long story short the truck sat there for two days without them getting to it so we went and picked it up. Keep in mind we called for an appointment and had to wait a few days and went in when they said to bring it.

It's now at another garage (friend of a friend) so we'll see what they find.

I still have to think it's electrical in nature and not related to the parking brake as it came on when we unplugged the trailer the last time. Tried plugging the trailer back in but that didn't get it to come off.

I'll post when I hear back from the garage.