What was found
FUEL MIGRATION FROM RT TO LT TANK. LT 18.2, CTR 0.2, RIGHT 3.8. FOUND DURING MX CHECK. (REPLACED RT TANK INBD FUELING SHUT-OFF VALVE IAW AMM 28-21-02, REF:W/O 7507, REPLACED RT MAIN TANK DEFUEL VALVE IAW AMM 28-26-01, REF W/O 7507, R & R FUEL PANEL DOORS 631BB, 632BB, 632DB IAW AMM 28-11-02; 28-11-01 LEAK CK GOOD. LEAK CHECK GOOD-NO FUEL MIGRATION OVER 18 HRS - NO LEAKS C/T FUEL PANELS AND VALVES. REF W/O 7507 PARTS - R & R SHUTOFF VALVE OFF PN 60160-5, OFF SN 6834, ON PN 60160-5, ON SN 5693 PARTS - R & R DEFUEL VALVE.