Random oil on steam deck

See attached images. The device was at the top of my bed for a few weeks - not being used so it died - then I went to travel and we noticed when we got to where we were going that the screen was messed up. I took it to get looked at and they said it was oil - important to note - we don't have any oil in our house. My bed has no sign of oil on it - nor does the bag it was in. It's just the device itself. Has anyone had this happen/know the cause/know what to do? Is this something covered under warranty? Any help is appreciated! Ps: this is also posted on the steam subreddit.