What was found
LEVEL 2 CORROSION, LOWER FUSELAGE AFT CARGO COMPARTMENT FROM FR56 TO FR 57 BETWEEN STRG-42L AND STRG-43L AFT ATG4 ANTENNA INTERNAL DOUBLER WITH CORROSION. PERFORMED REPAIR AT LOWER FUSELAGE AFT CARGO COMPARTMENT SKIN PANEL SECTION FROM FR 56 TO FR 57, BETWEEN STGR 42LH AND STGR 43LH I/A/W DELTA ER/A N. 636728-14 SECTION I REV ORIG DATED 10 SEP 26. NOTE: PERFORM SECTION II (REPETITIVE INSPECTION) THE SOONER OF 33600 FC / 67200 FH AFTER EMBODIMENT AND SUBSEQUENT INSPECTION AT INTERVALS OF EVERY SOONER OF 5000 FC / 10000 FH THEREAFTER. STRUCTURAL MODIFICATION POINT (SMP) AFTER REPAIR EMBODIMENT OF 50400 FC / 100800 FH. SEE LOG PAGE 1806136 FOR TIME CONTROLLED ITEM SECTION II. ASSOCIATED ER/A 00-636728 ADDED FOR AC 3253. (LP: 1809536, AIRCRAFT WAS GROUNDED)