What was found
EWR---CO3536, CREW REPORTED NOSE LANDING GEAR DID NOT RETRACT ON TAKEOFF, CONFIRMED BY EICAS AND WIND NOISE. RECYCLED GEAR ONCE, NOSE GEAR SUCCESSFULLY RETRACTED ON SECOND ATTEMPT. MAINTENANCE REMOVED AND REPLACED NOSE LANDING GEAR UPLOCK BOX IAW EMB145 MM 32-33-07. OPS CHECKED, SYSTEM GOOD. AIRCRAFT RETURNED TO SERVICE.