As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
PIT - DURING SIP AND B-CHECK, FOUND 4 INCH CRACK IN FRONT PRESSURE BULKHEAD LOWER CONNECTION ANGLE AFT SIDE FRAME 1550 BETWEEN STRINGER 3 AND 72. DETECTED BY VISUAL/EDDY CURRENT. STOP DRILLED CRACK ENDS AND INSTALLED TWO EXTERNAL DOUBLERS PER SRM 53-02-18 FIG 11. (M)