What was found
SELECTED FLAPS 1 LE SLAT ASY EICAS MSG. ACTIONED QRH LANDED FLAPS 20 PER THE CHECKLIST. EMERGENCY DECLARED. REF FIM 27-51 FT 809 AND 27-81 FT 809 ON FLAP SLAT ELEC UNIT FOUND FAULT CODE 27-81021 LE OUTBOARD ASYM, REF FIM 32-09 FT 803 PERF PSEU BITE AND FOUND FAULTS FOR SENSOR 294 R SLAT #12 O/B AND 305 R SLAT #7 I/B. REF AMM 27-88-01-2 VISUALLY INSPECTED S305 AND S294, NO DEFECTS NOTED, ALL HARDWARE PRESENT AND PROX SENSOR TARGET GAPS ARE WITHIN LIMITS. ERASED FAULTS AND CYCLED SLATS/FLAPS MULTIPLE TIMES WITH NO FAULTS NOTED, PERF BITE ON FSEU AND FIM 32-09 FT 804 PSEU SLAT SYS 507 TEST, TARGET/SENSOR TEST S294 AND S305 WITH NO FAULTS DETECTED. NO HISTORY AND COULD NOT DUPLICATE FAULT.