Emanzano

Hey guys, I have a 2020 Silverado RST with a sunroof. About a year ago it started leaking every time it rains heavily. I have taken my truck 5-6 times to 3 different dealerships and they all say that they can’t find why it leaks. I have done 2 GM claims and they are useless. They told me that they can’t fix it if the dealership doesn’t diagnose the problem, and to take it whenever it leaks. Here in Houston it has rained when the dealership is closed, and my warranty is about to expire in 2 weeks. Has anyone gone thru this?? It leaks just on the passenger side at the corner of the sunroof where the onstar speaker is at.