As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING AN OPERATIONAL TEST OF THE CABIN PRESSURIZATION SYSTEM, FOUND MAXIMUM DIFFERENTIAL COULD NOT BE OBTAINED WITH THE TEST UNIT. INVESTIGATION FOUND A 3 INCH OPENED CRACK IN THE LOWER FLANGE, CENTER CLOSE-OUT PANEL FOR THE AFT SPAR. STA 227.125. EFFECTED REPAIR AND RETURNED TO SERVICE.