That's where the sunroof motor is housed. Could be one of the (3?)
screws holding the motor in place has become a bit loose. You won't
damage the headliner if you use a flathead screwdriver - the panel is
held in place with plastic tabs. the problem is that you might break a
few of those - that's what happened to me. There were still enough to
hold it in place afterwards though ...
Let us know how it goes ...
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