What was found
ON TAXI RECEIVED MSG TRAILING EDGE FLAP DISAGREE AND T/E FLAPS WOULD NOT MOVE. MX FOUND SENSOR M548 FAULTED ON FSEU FLT CANCELED. FLAP BYPASS VALVE NOT MOVING FROM BY PASS POSITION. ELEC CONNECTOR FOUND LOOSE AND CONTAMINATED, SAME CLEANED AND REFITTED SUBSEQUENT 6 X FULL FLAP CYCLES ACTIONED WITHOUT FAULT. ORIGINAL FSEU REFITTED, FLAPS TESTED AGAIN WITHOUT FAULT. BYPASS VALVE OPS CHECKED OK VIA ALT T/E SWITCHES FLAPS OPERATE AND INDICATE NORMALLY.