As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING INSPECTION FOR CRACKS ON THE RIB FLANGES OF THE HORIZ STABILIZER ASSY, THE RIB DESCRIBED BELOW WAS FOUND CRACKED (ALONG WITH 7 OTHER RIBS; EACH RIB FAILURE IS DOCUMENTED ON SEPARATE SDR FORMS) ON THE LOWER FLANGE AT RT HORIZ CANTED STA 13.78, BETWEEN THE FWD AND AFT SPARS. CRACKS EMANATE FROM THE FASTENER HOLES. THE RIBS WERE REPLACED IAW KIT 128-6200-001.