What was found
PDIS 166 27-80 0117 26OCT18 MEM FACT U LOGPAGES:2670727 LE SLAT DISAGREE WHEN GEAR SELECTED DOWN & FLAPS 20. RAN QRH, LANDED F20. RETURNED FLAPS ON DECK VIA ALT MEANS. NO OVERSPEED. FACT 26OCT18 08:17 MEM U WITH NO HISTORY NOTED. PERFORMED BITE CHECK OF PSEU REF FIM 32-09 FAULT TREE 803, NO FAULTS NOTED. PERFORMED BITE CHECK OF FSEU REF FIM 27-51 FAULT TREE 809, NO FAULTS NOTED. PERFORMED OPS CHECK OF FLAP AND SLAT PRIMARY DRIVES AND POSITION INDICATING SYSTEMS TEST REF AMM 27-51-00-705-508. SYSTEM TEST GOOD, NO AJUSTMENT WERE MADE. IN ADDITION PERFORMED SLAT ALTERNATE AND DRIVE SYSTEM TEST REF AMM 27-81-00-735-277. SYSTEM TEST GOOD, NO ADJUSTMENTS WERE MADE. A/C OK FOR SERVICE.