Volvo: inside roof headliner noise, volvo s 40, sunroof

Question
I have a 2000 Volvo S-40 1.9T. The headliner just behind the middle of the sunroof is making noise. How can I get this noise to stop without a major removal of the headliner?  

Answer
Clarify...what exactly is making noise?  Is the headliner not secure to the roof, or is the moonroof assembly making the noise?  I happened across a step-by-step procedure demonstrated on a 90 volvo at this website:  http://www.diynet.com/diy/ab_interior/article/0,2021,DIY_13689_3024334,00.html