As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT WAS NOT GROUNDED AND IS IN CHECK FOR SCHEDULED MX. DURING INSPECTION OF THE AFT CABIN FLOOR STRUCTURE A CRACK WAS FOUND ON LH SHEAR PLATE BETWEEN FR 69 TO FR 70. REPLACEMENT IS REQUIRED. PERFORMED REPLACEMENT OF LH SHEAR PLATE IAW-SRM-51-72-11-REV 43. MX ACTION IS ACCEPTABLE.