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I'm reckoning that the runners (the rails the sunroof moves back & forward on) need greasing due to lack of use.
When it was re-opening, that would be a 'bounce-back' safety feature designed to prevent people (or parts of them) trapped.
I'm pretty sure some penetrating fluid will allow the roof to re-open, but would grease all the moving parts (including the deflector rail).
Hope that helps.
This job should never be complete - the day I think I've done it all, is the day I resign.
Currently in VelSatisfied's garage:
2005 FIAT Ducato 2.8JTD LWB Gran Volume, 2000 Kawasaki ZZR 1100 D7 'fullpower' in black + full GIVI & KAPPA luggage, 2007 MB R-Class 320 CDi Sport LWB uprated by Brabus to 300Bhp don't know if there's a 155mph limiter - will be fun finding out! 2004 Mercedes Vaneo 1.7 CDi Ambiente 7-seater