What was found
INSPECTION TYPE:4C, DISCOVERED CORROSION ON MAIN CARGO CENTER WING TANK UPPER SKIN AT STRINGER 15 XCW=21, ACCOMPLISHED REPAIR ON MAIN CARGO CENTER WING TANK UPPER SKIN AT STRINGER 15 XCW =21 IAW EA 011-5730-01-A5751, REV I/R AND EO MD11-5730-56853-A.