What was found
FLT 587 - MEX-CUN - DURING MAINTENANCE INSPECTION MECHANIC REPORTED A FUEL LEAK BY THE DRAIN OF THE RIGHT WING FORWARD SPAR. ACCESS OPENED, FOUND THE MENTIONED LEAK IN THE FUEL CROSSFEED VALVE. CROSS FEED VALVE WAS CHANGE IAW MM 28-20-12, TESTS OK. AT MEX RON 15/16, WAS RE-CHECKED THE REPLACEMENT, EVERYTHING WAS OK. (M)