Help! Rear sunroof stuck in tilt position!

[x5pdx]

Anyone know why my rear sunrrof is stuck? My front sunroof will tilt up and down, but the rear one is stuck open in tilt. The sunroof cover will go back and forth. My car is out of factory warranty. I do have extended warranty with Warranty Direct for major care only. I will have to check if the sunroof is covered. I've been reading some older posts and can only find some info on the sunroof cassette? Was this an ongoing problem? Any suggestions would be appreciated. Thanks.

I have a 04 X5 4.4i. My cat converter went out in April and they replaced it for free under 80k emissions warranty. They also replaced some other sensor and said it was my one time "good faith" repair.