As you probably know, water leaks can come from sources several feet away....
-Check the caps driving lights for good seals or caulking
-Roof penetrations, properly caulked and sealed. Anywhere from the front third of the roof forward
-On your coach, is the windshield upper gasket above where the leak is, or is the dripping above the top of the windshield gasket? If below the gasket, then checking that or good seal is another source.
-One that I've seen on a few coaches, is the AC's sometimes need to have their four bolts lightly tightened to ensure a good seal roof/gasket/bottom of AC. (And, sometimes the AC gasket needs replacing.)
-On the AC front. If your AC has a pan with a hose to drain the condensation, I've seen sometimes where the hoses come unhooked or have a problem along their path from a roof penetration.
-I've also seen leaks from over the door awnings, or large awnings that extend towards the front to also cover the door.
-And the front cap seems to be one of the least insulted parts of a coach, so condensation can be building up and running anywhere.
I am sure others will provide other ideas too
Our coach, has a drop that comes in from time to time, from the trim above the windshield. Seems to be coming in from somewhere over the front right of the rig, then as water will do, travel until it forms a drip. Our drip is anywhere from 12" L/R of dead center, at different times. Pushing the plastic trim, we can find moisture moving towards the passenger side. We've gone thru some of the above sources to rule them out. And it is either a leak we have not been able to stop from the over the door awning, or more likely, we have a windshield leak from the gasket area. We have a chip in the front right windshield and will replace the gasket when screen is replaced.
Best of luck on your search, and please let us know what you determine was the source,