This is a bit weird... my driver's seat started to tip backwards as if the front of the rails were no longer secured. On investigation it seem the mechanism that raises the front/back of the seat squab had let go at the front. I've pushed it back together and restored some function by winding the front down with the motor but it's still not working as before.
There's also a large piece that seems to flap up and down depending on the direction of travel. Sorry for the terrible explanation but has anyone come across this before?