What was found
FLT 3633 - LGA-BTV - NR 2 HYDRAULIC SYSTEM PRESSURE FELL TO ZERO FOLLOWING GEAR RETRACTION ON DEPARTURE FROM LGA. CREW DECLARED AN EMERGENCY AND RETURNED TO LGA WITHOTU FURTHER INCIDENT. VERIFIED LEAK AND REPLACD NOSE GEAR DRAG STRUT ACTUATOR FLEXIBLE HYDRAULIC LINE. ALSO, REPLACED NR 2 ENGINE HYDRAULIC PUMP DUE TO OPERATION WITHOUT FLUID. SUBSEQUENT OPERATIONAL AND LEAK CHECKS NORMAL. AIRCRAFT RETURNED TO SERVICE. (M)