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 HORIZONTAL STABILIZER ASSY, THE RIB DESCRIBED BELOW WAS FOUND CRACKED. ON THE LOWER FLANGE AT LT HORIZONTAL CANTED STA 13.78, BETWEEN THE FWD AND AFT SPARS. CRACKS EMANATE FROM THE FASTENER HOLES. THE RIBS WERE REPLACED IAW MFG KIT 128-6200-001.