As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING M-CHECK FOUND MAIN PASSENGER CABIN STA 1136, LONG 16L CRACKED. FWD EXISTING SPLICE HAS WRONG FASTENERS INSTALLED & FWD END OF LONGERON SECTION DOES NOT MEET GAP REQUIREMENTS. REMOVED L16L AT STA 1136 FABED NEW LONGERON PN S2777922-4 AND INSTALLED IAW SRM 53-02, FIG 18.