What was found
LEFT CENTER TANK UPPER REAR SPAR CORRODED AT XCW 13, 18, 52, & 59L. CORROSION ON UPPER CENTER TANK WAS REPAIRED IAW ER/A 543586-14, FASTENER HOLES DAMAGED COMMON TO CORROSION BLENDOUT AREA. WERE REPAIRED IAW PRI, REV 3, 543589-14 AND ER/A 543589-14, REV ORIGINAL. ASSOCIATED ER/A 54-358914 ADDED FOR AC 9554.