What was found
SJU - FLT 1786 - AFTER TAKEOFF ANU, LANDING GEAR WOULD NOT RETRACT IN SYSTEM 2. SELECTED SYSTEM 1 AND LANDING GEAR RETRACTED NORMALLY. AIRCRAFT PROCEEDED SJU AND LANDED WITHOUT INCIDENT. PLACARDED LANDING GEAR SYSTEM 2. SUBSEQUENTLY REPLACED RT MAIN LANDING GEAR SYSTEM 2 PROXIMITY DETECTION SENSOR 12GA AND ACCOMPLISHED BITE CHECK OF POSITION DETECTION UNIT WITH NO DEFECTS FOUND. SYSTEM GROUND CHECKED NORMAL OPERATION AND PLACARD REMOVED. (M)