As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ULTRASONIC INSPECTION OF FRAME 21 FROM STRINGER 20L TO 20R FOUND 2 AREAS, 1 APPROX 1 INCH IN LENGTH BETWEEN FASTENERS TOTAL LOSS OF BACKWALL IN AREA AND SECOND APPROX 1/2 INCH IN LENGTH BETWEEN FASTENERS LOWEST READING .030 INCH. COMPLIED WITH REPAIR FOR FRAME 21 FROM STRINGER 20L TO 20R IAW SRM 53-00-01 PER SB 120-53-0065.