As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
WHILE INCORPORATING SB 670SH-53-043 REV C, WE HAVE ENCOUNTERED MISMATCHED FACTORY PILOT HOLES @FS 843 LBL 18 COMMON TO THE LBL18 FLOOR BEAM AND PRESSURE BOX EXISTING HOLES. REPAIRED BY INSTALLING A FREEZE PLUG IAW MHIRJ REO 690-53-41-502 REV -- DATED 2024-10-11.