What was found
TRAILING EDGE FLA DISAGREE EICAS MESSAGE WHEN SELECTING FLAPS 1, RAN QRH USED ALTN FLAPS 20 FOR LANDING. AFW U HAD CONFERENCE WITH INBOUND CAPTAIN, STATED WHEN MOVED TO FLAPS 1 HAD NO ACTION, HAD NO ROLL SITUATION ALSO. WENT TO ALTN FLAPS AND LANDING UNEVENTFUL. REMOVED AND REPLACED THE BYPASSED VALVE, IAW 757 AMM 27-81-09-4. RAN THE FLAPS THROUGH HYD AND ELECT ALT (AND WITH LEFT ENG RUNNING), IAW 757 JRH CHPT 5. OPS CHECK GOOD, NO DEFECT NOTED. A/C OK FOR SERVICE. REASON CODE: SCHEDULED REMOVAL/INSTALLATION OFF MPN: 340545 POS: 1 ON MPN: 340545 SRL: 3395 TAG NBR: C96915.