There are two ways to get the actuator to calibrate. Both are listed in the repair manual. One is to pull the fuse for 30s, reinsert the fuse, then turn the car on (not start) and do not touch the climate controls for 2 minutes.
The other is to hook it up to a scan tool and ask it to recalibrate, which is what the dealer is doing.
I also found that you can disconnect the electrical connector on the actuator. Start the car let it run for 30s. Turn the car off, reconnect the actuator. The next time the car is turned on it will automatically recalibrate.
But there is no guarantee the recalibration will work. The actuator could be shot.