As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
WHILE TROUBLESHOOTING A PRESSURIZATION DISCREPANCY USING A PRESSURE CART, AIR FLOW WAS NOTED COMING FROM UNDER THE RIGHT AVIONICS SHELF. FURTHER INVESTIGATION REVEALED A CRESENT SHAPED CRACK IN THE FWD PRESSURE BULKHEAD AT FS 84 BELOW THE SHELF. THE CRACK RUNS LATERALY 4 INCHES, ON RT LOWER WEB, UNDERNEATH STIFFENER P/N 114-410026-55.