As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
LEFT WING INTERNAL, 4 AREAS OF LIGHT CORROSION ON BOTTOM HORIZONTAL LEG OF FORWARD SPAR FROM XCW 58 TO 12 INCHES OUTBOARD OF XCW 58. -- BLENDED AREAS. AREAS ARE ACCEPTABLE FOR STRENGTH, IAW BOEING TELEX MWX-ORD-01-00147H DATE 21 FEB 01.