As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) THE AIRCRAFT WAS PERFORMING AERIAL FERTILIZATION OPERATIONS. THE HYDRAULIC LOAD CELL THAT IS ATTACHED TO THE CARGO HOOK FAILED INTERNALLY. THIS FAILURE ALLOWED THE HOOK TO ROTATE APPROXIMATELY 90 DEGREES WHICH IN TURN CAUSED THE MANUAL RELEASE CABLE TO BE PULLED AND RELEASED THE HOOK. THE FERTILIZER BUCKET WAS RELEASED FROM THE AIRCRAFT.