As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DAMAGED RH HORIZONTAL STABILIZER RIB 12A. CRACK ON THE FWD FLANGE OF 0.800 IN LENGTH AND AFT FLANGE 0.600 IN LENGTH. REFERENCE WO# 2391571, EO# E175-55MR-017.2 REV IR, ACCOMPLISHED A PERMANENT REPAIR OF DAMAGE TO RIB 12A ON THE RH HORIZONTAL STABILIZER BY DIRECT REPLACEMENT OF THE AFFECTED RIB PER THE EO.