904 Leaking. What to check first?

Bad plan. Just guessing and trying to get lucky? Some people aren't patient when trying to pin down leaks. So they start replacing stuff and end up taking it to a shop because they get frustrated. I had a guy tell me his transmission was leaking and sent me a pic of a puddle under his truck. Haha. Real helpful. It was a loose line that he didn't get tightened up all the way when he installed it. Another one was a torn dip stick tube o-ring. Everybody wants to yank off the pan and plaster it with silicone...but pans are extremely difficult to learn how to straighten and tighten properly; providing you use the right gasket. Most pans leak if they're installed by beginners.