Why does rear driver side interior light fill w/ water when it rains and leaks?

What is your question?

I had an autobody shop lift the top panel on my 2004 Pilot while it was in there for an accident repair since this water leaking has been an ongoing problem while raining and during a car wash. They didn't find any issues with the panel; however, it continues to leak. I take off the plastic cover of the light to release the water and dry it out. How is repaired?