2004 fleetwood roof question

That year is often known as the Alumatite roof design. There are standing seam joints in the aluminum sheets under those tracks that can leak if the caulk wasn't done right at the factory or has deteriorated.

My 2005 is still original with no leaks, but I store inside, so it gets little thermal cycling. The plastic end caps are TPO, not ABS plastic.

If you store outside, you're well due to pull the tracks and recaulk the standing seam joints.