As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
WHILE PERFORMING TASK INS-2-2-27L0005 ITEM NR 6, CLEANING OF THE RIGHT REAR AILERON QUADRANT LOCATED ON THE AFT WALL OF THE MLG WHEEL WELL, DISCOVERED A CRACK ON THE SEMI-PRESSURE BULKHEAD FS 559.00, BL 23L-23R. PERFORMED REO 601R-53-41-350.