What was found
FLT 581 HPN-PBI, AIRCRAFT DIVERTED TO JFK DUE TO WING LEAK MSG AND TO AVOID ICING CONDITION. HOWEVER, DURING APPROACH THE CREW DECLARED EMERGENCY DUE TO SLAT FAIL. QRH COMPLIED WITH, ALSO GOT THE FOLLOWING EICAS MESSAGE, SHAKER ANTICIPATED, AOA LIMIT FAIL, SPOILER FAULT. ACCOMPLISHED T/S IAW 27-81-00. REMOVED AND REPLACED LT O/B SKEW SENSOR IAW 27-83-01. PERFORMED OPERATIONAL TEST IAW 27-80-00-710-801 FOUND SATISFACTORY.