Hi, water leaking into the boot has corroded the hydraulic/motor unit and the roof will not now respond to the control to lower it. I think I have pinpointed the leak so I can get that fixed. I understand that it is usually only the motor unit that needs replacing (plus any relays etc) but is not available separately from BMW from whom you have to buy the whole hydraulic unit (£2,727 including VAT). Google brings up a couple of suppliers/fitters (eg Zedshed, roofmotors) of reconditioned motors rather than the whole unit which are a lot cheaper. Has anyone experience of having gone for the reconditioned option and found them to be as reliable and serviceable as the original parts?... or can there be problems?