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The gearbox on our equivalent multi-point locking system failed due to a moving part (a small cast toothed-bar) breaking. Finding a replacement took a bit of googling, measuring, and talking to someone at a locksmith on the phone while they measured up a replacement, but I did find one. I used silicone spray to get everything running smoothly, but having recently used graphite on our front door cylinder (grinding a pencil lead into the keyhole) I can vouch for that making everything very smooth.
ffm
Polygon
Cheers guys, will try this tomorrow