Smart lock problem

[Kingfisher]

I've just bought my first Falcon, an AU wagon, after 20 years of Holdens. All is going well except for the Smart lock. I've read through the threads but can't find a similar problem.
The rear right actuator was stuffed so I replaced that today. All doors now lock/unlock properly using the key in the lock. The remote is communicating but will not lock or unlock the doors. I get multiple beeps from the horn which I believe means the system thinks a door is open - which it's not. The interior light powers down after 30 seconds which also indicates the doors are closed.
What do I check next?

[soulfire]

Have you tried reprogramming the remote?

[Kingfisher]

I figured it wouldn't be necessary as it seemed to be communicating. I gave it a go anyway and all seemed to happen correctly, except when the locks 'cycled' you could hear the actuators operating, but the door lock button didn't move.