Cleaned apt stove. In the enclosed area under the burners I found a little oblong pan with a round hole in one end. It was very dirty so I cleaned it with vinegar/baking soda. It looks like some kind of venting thing for the oven but I do not know what it is or where/how I should place it back inside the under burner space. Any help would be appreciated. I tried to find the manual so I could look there to see what it is and where it is supposed to go but couldn't find a manual on line. Thank you.