What was found
LEFT FUEL IS 1100 LBS LESS THAN RIGHT TANK DURING CRUISE AND DESCENT. FUEL ERROR READING LEFTW-49 RIGHT W-2400. BURN EQUAL AND LOAD EQULAT TAXI. TROUBLESHOOT REF TSM. SWAPPED FLSCU 1&2 SYS TEST NO FAULTS. TESTED FUEL TRANS VLVS PER TSM. NO LEAKS NOTED NEED FURTHER TS. APPROX 800 LBS USED FROM RT TANK ON NEXT FLIGHT ( 3 HOURS). TANK ENTRY NEEDED. SEE-FEEL INDICATOR ON XFEED VLV. ALSO MAKE SURE OUTER CELLS ARE FULL & INTERCELL XFR VLVS NORMAL BEFORE ACP TSM. REPLACED LEFT WING REFUEL VALVE PER MM. COULD NOT DUPLICATE UNWANTED FUEL TRANSFER. OPS CHECK GOOD.