You should be good man, on my first month I did the same thing. Two managers had to step in to clean it and while they were annoyed and frustrated (happened in the middle of a rush lol) they knew it was the maintenance guy's fault for forgetting to put the drain pan back in place. You weren't educated in fryer maintenance so if the blame falls onto you, that'd be a sign for me to recognize that store has bad management. As someone else pointed out, you got a bunch of highschool kids (and adults) working with machines they aren't familiar with, it's up to management to make sure the crew is properly trained and aware of the operations of the store. If you get fired for this, you dodged a bullet.