As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
THE CRACK WAS FOUND IN THE AFT BULKHEAD VERTICAL BEAM LBL 26.83 WL 257.0. THE CRACK IS ATTRIBUTED TO PRESSURIZATION CYCLES. RECOMMENDATION: THE SB 53-0182 RECOMMENDED TO INSTALL THE PREVENTIVE MODIFICATION AT OR BEFORE 60,000 CYCLES. SUBMITTER RECOMMENDED THE PREVENTIVE MODIFICATION MUST BE INSTALLED AT OR BEFORE 45,000 CYCLES.