My parents house has a leak in the roof that hasn't been takan care of for a few years and has pretty much destroyed the drywall in the affected region.
What strategy should I use to repair the leak?
I was considering removing the drywall (In preparation for a California patch) to see where the leak originates from (Possibly with the assistance of a second person with a hose on the roof) and looking for it that way.
I've also considered looking for the leak after the drywall has been removed, and if I can find it without a second person (If it's really obvious), just drilling a very small hole where the origin of the water is and leaving the drill bit sticking out of the roof and using roof caulk to seal it up there. I could patch the drywall later then.
What is the typical procedure for a situation like this?