What was found
FLT 1046, WHILE RETRACTING FLAPS OUT OF BNA, RECEIVED -SLAT LO RATE- MESSAGE. WHEN EXTENDING FLAPS IN JFK, RECEIVED -SLAT FAIL- MESSAGE. TSI PREVIOUSLY ASSIGNED FOR TROUBLESHOOTING OF SLAT FAIL MESSAGE. PERFORMED TROUBLESHOOTING REF TSI N236 101011. REMOVED & REPLACED SLAT 3 & 4 SKEW SENSOR AS PER AMM 27-83-01 AND REMOVED AND REPLACED SLAT HARNESS W511, N512 AS PER AMM 27-83-07. PERFORMED OPS CHECK. OPS CHECK SATISFACTORY.