Ah, falcon central locking

Well. Today was the day to fit a new drivers door lock actuator.

eBay gave me an after market part. Door lining off again. Mechanically an easy fit.

But. Not. Working.

Eventually, I worked out it was half phase out of sync mechanically/electrically. For me the way to solve it was to open the actuator drive and wind it to the position the car was expecting electrically. Everything is nice now.