As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT PITCH TRIM CONTROL FROZE IN PLACE, DURING FLIGHT, DUE TO THE RIGHT PITCH TRIM ACTUATOR CHAIN SPROCKET PN 556450-6 BECOMING DISLODGED FROM ACTUATOR DUE TO ATTACHMENT PIN FOR THE SPROCKET PN S2637-6Z11 COMING OUT OF THIS SPROCKET TO SHAFT ATTACHMENT. ACTUATOR WAS REPLACED WITH ANOTHER, SAME PN, OVERHAULED UNIT. PITCH TRIM SYSTEM RIGGING SET AND OPERATIONAL TESTED GOOD.DETAILED INFORMATION ON THIS REPAIR IS ON FILE ON W.O. 5868.