As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
L/H HORIZONTAL STABILIZER RIB #6 STAB STA 138.70 THE #3 STIFFENER IS CRACKED. VERIFIED CRACK AT L/H HORIZONTIAL STAB RIB #6; STAB STA.138.70 STIFFNER #3. PER BOEING NDT MANUAL PART 6; 51-00-00 PROC.23 / REPAIRED #3 STIFFENER PER SRM 55-10-09-2R-4.