I don’t want to further muddy the waters but there is an elevator AD on the 767 relating to some shear pins, that are designed to break if the elevators become jammed. This action allows the others actuators to work and control the elevator. It is stated in the AD that some of the same shear pins were found broken and disconnected from the system, so an AD was issued mandating inspections.
https://www.federalregister.gov/agen...administration
The loss of three shear pins renders the aircraft uncontrollable in pitch.