As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING MAINTENANCE BASE VISIT FOUND THE FUESLAGE SKIN, FRAME 66-67, STRINGER 21L-21R TO HAVE INTERNAL CORROSION. THE AIRCRAFT WAS REMOVED FROM SERVICE. INSTALLED DOUBLER AND FILLER AT FRAME 67 IAW AE EO EM-53MR-1826. THE AIRCRAFT WAS RETURNED TO SERVICE.