What was found
L/E SLAT DISAGREE MSG. RTFL. INITIAL FINDINGS L/E & T/E WERE PHYSICALLY IN DISAGREEMENT (CONFIGURATION) - FLAPS FULL UP & SLATS AT ABOUT 15. FSEU1 FAULTED SLAT PDU & R SLAT TRANSMITTERS. T/S REF MM 27-58-01 PG 501 & FOUND EXISTING SLAT PDU POSITION XMTR ANGLE READINGS ARE GOOD AT ALL FLAP HANDLE POSITIONS. BIT FSEU BOXES & FOUND FSEU 1 FAIL BIT EVEN AFTER SWAPPING POSITIONS. REPLACED FSEU 1 & RECHECK SLAT PDU TRANSMITTER ANGLES WITH INSP TIME PRESENT TO VERIFY ANGLE ACCURACY GOOD. CYCLED FLAP HANDLE MANY TIMES THRU FULL TRAVEL AND NO MSG.