As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING INSPECTION OF THE FS 178 BULKHEAD AND SURROUNDING STRUCTURE PER BAC S/B 737-53A1173, THE ADJACENT COCKPIT FLOOR WEBS COMMON TO THE FS 178 BULKHEAD AT WL 207 AND LBL & RBL 24 WERE FOUND CRACKED. THE DAMAGED WEB SECTIONS WERE REMOVED AND NEW SECTIONS INSTALLED IN ACCORDANCE WITH THE S/B AND ER/A 378160-14AD.