As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) FLIGHT LOADS AND FREE PLAY HAD ELONGATED THE BOLT HOLES FOR THE HORIZONTAL PITCH TRIM ACTUATOR ATTACHMENT, IN THE BUILD UP STEEL AND ALUMINUM STABILIZER RIB ASSY. IT IS SUSPECTED THAT THE LOW TORQUE APPLICATION AT PREVIOUS INSTALLATION HAD ALLOWED THE BOLT TO WORK THE HOLES.REPAIRED BY INSTALLING STEEL BUSHINGS INTO THE RIB ASSEMBLIES.