As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) CRACK FOUND ON THE ELEVATOR INBOARD RIB BRACKET. FURTHER INVESTIGATION FOUND THAT THE INBOARD RIB P/N 50-610000-355 AND THE FRONT SPAR FLANGE ALSO HAD CRACKS AT THE RIVET AND BOLT HOLES. CLUSTERS OF METAL FILINGS WERE TRAPPED BETWEEN THE BRACKET AND THE RIB. IT WAS CONCLUDED THAT STRESS RIZERS WERE FORMED BY THE FOD BETWEEN THE TWO ASSEMBLIES LEFT THERE DURING MANUFACTURE.