Trunk door does not open when activated by remote or switch on door on 2006 Mercedes-Benz R350

The trunk door does not open when remote is activated or with switch on door.

Asked by for the 2006 Mercedes-Benz R350
Could be a problem with the actuator. The panel has to be removed to get access to the actuator. The diagnostic may requires an OE diagnostic computer.

what do you think the cost could be.