I've noticed in the past that the plastic track guide for the sunroof window had some cracks. Well yesterday, I went to the carwash and water started leaking in through the sunroof. I got out, and the galss was not flush with the roofline. I pushed the button to close the roof, and it started making all these horrible cracking noises. I pulled back the sunroof shade and saw pieces of that broken track everywhere. Some of them were blocking the track, and others were just laying around up there. I took out a little swiss army knife and cleared the pieces off the track. The window opens and closes fine now.

What's my next course of action? How hard is it to replace that plastic track liner? Or can I just live without it?

Thanks!