As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
HORIZONTAL STABILIZER WAS REPAIRED AT AIRCRAFT TOTAL TIME OF 6658.5. 6 EACH NEW AND IMPROVED NOSE RIBS WERE INSTALLED AND NUMEROUS RIVETS WERE NOT INSTALLED IN THE REPLACED RIBS. REFERENCE SERVICE NEWSLETTER NR 87-18R1. RIBS THAT WERE DETERMINED TO BE REPLACED ARE AT STATION 14.74 THRU 35.915 LT AND RT OF HORIZONTAL STABILIZER CENTER LINE.