a friend of mine had that problem and he sorted it by operating the switch to bring mirrors in at the same time the 1 that would not fold in he did it by hand and then operated the switch to push mirros out and the biggest cause of the problem was the mirror had been knocked in at some time and pushed by force back out
Thanks for the quick reply, I've tried either pushing out or in both mirrors seperately. However when the button is pressed it does a cycle which then leaves then out of sync again