What was found
ON TAKEOFF, WHEN GEAR SELECTED TO THE UP POSITION, ALL UPLOCK INDICATION ON NR 1 AND NR 2 PANELS AND THE GREEN HYD PUMP PRESSURE FLUCTUATES BETWEEN 1500 PSI TO 3000 PSI. ALSO, HEARD A HARD NOISE. AIRCRAFT RETURNED TO AIRPORT. REPLACED BOTH PROXIMITY SWITCHES AT THE NOSE GEAR. (M)