Make sure you have a #2 Robertson bit (square) that is what fits the screws they put these things together with.
I would also suggest a moisture meter. If you use it after a heavy rain it can pinpoint a potential leak, sometimes before it is visible. I have a couple of pretty expensive ones from work. They come in penetrating and non-penetrating. I use the non-penetrating to just get an idea if moisture is present then use the other one to narrow it down.
The two tools I use the most are a VOM (Volt-Ohm Meter) and a Klein 11-in-1 screw driver.
Another thing I have done is get PDF copies of all of my various manuals and put them on a thumb drive. I also have them stashed on a Cloud Drive so I can get to them with my cellphone or tablet in a pinch.