As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CWF - TRACES OF FUEL HAVE BEEN FOUND IN THE CENTER WING DRY BAY OF A330-300 AIRCRAFT AT RIB 1. AS A RESULT OF THIS AN INSPECTION WAS PERFORMED ON THIS AIRCRAFT & FASTENERS WERE FOUND LOOSE & LEAKING AT FR42 LEFT & RIGHT SIDE AT RIB 1. BOLTS WERE REPLACED & AREA WAS SEALED IAW EA 102839B & 102875A.