As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
WHILE AIRCRAFT WAS OUT OF SERVICE IN HEAVY CHECK. CRACK SUSPECTED AT RH HORIZONTAL STAB RIB 12A. FOUND CRACK AT RH HORIZONTAL STAB RIB12A REPLACED RIB IAW 170EO-55-10-0004. AIRCRAFT REMAINS OUT OF SERVICE FOR THE REMAINDER OF THE CHECK.