Hi Wizard,
I grant you, there may well have been a decouple following impact but the report does not state that.
A servo does not move unless there is an input - IF it is working correctly.
A servo mounted the way they are in the s76 should not go to full extension/retraction if you disconnect the imput unless the input is moved. The weight of the imput lever itself will normally ramp it down. With the control rod attached it will almost certainly ramp down under weight alone.
But thats static - with rotors running who knows.