What was found
L/E SLAT ASYM EICAS LIGHT CAME ON ON APPROACH WHILE SLOWING FROM 250K TO 220K. AT 220K WITHOUT MOVING ANY SLAT/FLAP CONTROLS THE LIGHT ILLUMINATED. FOLLOWED QRH PROCEDURE. T/S IAW FIM 27-81-00-815-804. FOUND FAULT CODE 317 ON FSEU NR 1 AND FAULT CODE 337 ON FSEU NR 2. PER FIM T/S TO BAD GROUND FROM FSEU NR 2. REPLACED FSEU NR 2 IAW AMM 27-51-01-722-005. ALL OPS CHECKS PASS W/ NO FAULTS NOTED, EICAS MSG CLEARED FAULT LIGHT EXTINGUISHED. NO FURTHER DEFECTS NOTED, OK TO CONTINUE. ROTABLE PARTS CHANGE WAS INDICATED - TT 1486557 SN OFF 03330. FSEU NR 1: 317 FAULT CODE, FSEU NR 2: 337 FAULT COMMENTS : REF FIM 27-81-00-815-804 UNIT, FLAP AND SL OFF 19-2758-9-0002 3330 ON 19-2758-9-0002 2671 DECLARED EMERGENCY LANDING.