What was found
FLT NR 1304, IAD-JFK, SLAT FAIL WHEN MOVING FLAP HANDLE TO 1. AFTER FOLLOWING QRH SLAT INDICATION OF ZERO AND AMBER FLAPS 2 (FLAP HANDLE 2) GREEN. OTHER MSGS, SHAKE ANTICIPATED, AOA LIMIT FAIL, SPOILER FAULT, SLAT FAIL. FOUND SLAT SENSOR AT FAULT OB, R&R PREVIOUSLY REPLACED OB SLAT SKEW SENSOR. R&R LT IB 1-2 SLAT SKEW SENSOR IAW 27-83-01. INSTALLED NEW SLAT WING ANTI-ICE BELLOW BETWEEN SLATS 3 & 4 IAW AMM 30-11-01, OPS CHECK OK.