As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING C-CHECK, REMOVAL OF HORIZONTAL STABILIZER REVEALED THAT RT STABILIZER ATTACHMENT PIN WAS SEVERELY RUSTED AND BROKEN IN HALF. ALSO, FOUND FAIL-SAFE BOLT INSIDE PIN SEVERELY RUSTED. SUBMITTER STATED PART FAILURE DUE TO LACK OF LUBRICATION.