Can I help? Good question...let me describe what I observed when we managed to crash the turret on a HL1.
The turret is driven by a servo motor which indexes the turret into a position so that when it locks down the dogs are aligned. The servo is connected via a flexible coupling that clamps onto the shaft without any keyway. In our crash the spindle was not running but we had the turret too close so when it moved out to release the dogs it bumped into the chuck and when the servo tried to rotate it all that happened is the coupling slipped a bit and the servo overloaded and alarmed. After we had jogged things clear and tried a toolchange, because the coupling has slipped the servo did not rotate the turret into the correct position for the dogs to align so it could not lock back and gave a turret lock alarm.
I watched the tech realigning things and this is what I managed to observe:
The tech took off the top cover to expose the servo drive and coupling, loosened the clamp on the coupling, unclamped the turret with a G43 (I think), turned it to position 1 by hand, did a turret fwd command to T1, clamped the turret with a G44 and then retightened the clamp.
Maybe somebody will come on with some more specific advise but this could help you if it seems to concur with the instructions you got from Haas. If not sorry I cannot help.