What was found
AT FLAPS 30, NOTICED AMBER A/S FOOT & PLI COVERING THEN RECEIVED, LE SLAT ASSYM ALERT. AT APPROX 160 KNOTS SLOWING & COULD FEEL AERODYNAMIC RUMBLE. ELECTED TO G/A. ON G/A AFTER COMPLETING PROCEDURE, CREW NOTED ROLLING MOMENT. COMPLETED QRH PROCEDURE FOR, LE SLAT ASSYM. PLACED FLAPS FOR FLAPS 20 LG. ON FINAL CREW NOTED NO ROLLING AT FLAPS 20 DEG & 172 KTS. USED FIM 27-81 FAULT TREE 809, LE SLAT ASSYM, EICAS & FOUND PSEU FAULT 010 CARD ON FIRST TEST. SECOND TEST FOR FLIGHT LEG, BOX WOULD NOT DISPLAY ANYTHING AS IF THE BOX STOPPED OPERATING. R & R PSEU IAW MM 32-09-04-4. NO FAULTS SHOWN, OPERATIONS CHECKED NORMAL. RAN FLAPS & SLATS SEVERAL TIMES WITH NO FAULTS. FLAP & SLAT ELUX UNIT SHOWS NO FAULTS.