As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CORROSION DAMAGE TO INTERNAL SKIN BETWEEN LONGERON 21-22L, FRAMES Y1037- Y1058 AT AFT CARGO COMPARTMENT, DAMAGE IS ESTIMATED TO EXCEED THE ALLOWABLE LIMITS. SUMMARY OF NRC 00656: CORROSION LEVEL 2. INTERNAL SKIN BETWEEN LONGERON 21-22L BTW FRAMES STA Y=1037 - Y=1058 AT AFT CARGO COMPARTMENT WAS REPAIRED PER ER/A 610195-14 REV ORIGINAL SECTION I: PERMANENT REPAIR. (LP #2906095)