I have changed my coolant and after a year I noticed that i have a missing panel under my car. I dont know if it fell off or if a dealer removed it during an oil change. Since I cant detect how it happened I am interested in getting a new one. The purpose of this post though is to ask how to take it out and put it back in. The reason is that when i removed the panel in the past I was changing the coolant. During the time i change the coolant removing the panel I broke a tab on one side. So when I put it back in or remove it again I want to make sure I dont break the tab again. I hope this makes sense?