As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING CHECK-C MAINT IN THE AFT CARGO COMPARTMENT A FORMER WAS CORRODED AT STA 1308, LONGERON 28R TO 23L. REMOVED FRAME FROM LONGERON 18R TO 18L. INSTALLED NEW FRAME. INSTALLED SPLICE BETWEEN LONGERON 25R AND 26R PER SRM 53-03, PAGE 4C, AND FIG 2A FOR THICKNESS 0.071 TO 0.080.