As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
THE WOODRUFF KEY (M2536) THAT LOCKS THE IMPULSE COUPLING ON THE SHAFT WAS FOUND LODGED UNDERNEATH THE IMPULSE COUPLING PAWL, RENDERING ONE OF THE TWO PAWLS IMMOBILE. THE PIN ATTACHING THE PAWL WAS BENT AND THE GAP BETWEEN THE PAWL BOSS AND PLATE WAS NEAR LIMITS. A POSSIBLE CAUSE WAS THAT WOODRUFF KEY WAS NOT PROPERLY SEATED, AND INSTALLATION OF IMPULSE COUPLING DISLODGED THE WOODRUFF KEY. EVENTUALLY THE WOODRUFF KEY LODGE ITSELF UNDER THE PAWL.