As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
THE COCKPIT FLOOR WEBS AT WL 207 THAT EXTEND FROM FS 178 TO FS 188 O/B OF LBL AND RBL 24 WERE FOUND CRACKED. THE CRACKS WERE FOUND DURING INSPECTION AND MODIFICATION OF THE FS 178 BULKHEAD WEB PER BAC S/B 737-53A1173, REVISION 3. THIS ER/A INSTRUCTS TO REPLACE THE WEBS IN ACCORDANCE WITH THE S/B. ER/A 378400-14AD.