What was found
**SUPPLEMENTAL SDR** FUEL STARTED L13.0 USED 7.2 = 5.8. LEFT GAUGE READS 5.4. FUEL STARTED R13.2 USED 7.7 = 5.5. RT GAUGE READS 6.2. FUEL IMBALANCE DID NOT AGREE WITH FUEL FLOWS IN CRUISE. PERFORMED OPS CHECK OF LH DEFUEL VALVE PER AMM 28-26-01. OPS CHECK GOOD. REMOVED AND REPLACED LEFT HAND DEFUEL VALVE I.A.W. UPS B757 AMM 28-26-01-004-144 AND AMM 28-26-01-404-145 THROUGH STEP E-10 REMOVED AND REPLACED RIGHT HAND FUELING SHUTOFF VALVE I.A.W. UPS B757 AMM 28-21-02-004-017 AND AMM 28-21-02-404-019 THROUGH STEP H-24 MINUS STEP H-23. PERFORMED OPS & LEAK CHECK OF RH FUELING SOV PER AMM 28-21-02. FUELING ACTUATOR INSTALLED PER AMM 28-21-12. ALL CHECKS GOOD. DEFERRAL CLEARED.