What was found
FAT - LANDING GEAR FAILED TO RETRACT AFTER TAKEOFF. AIRCRAFT RETURNED TO STATION WITHOUT INCIDENT. MAINTENANCE FOUND LEFT GEAR 'A' SYSTEM UP PROXIMITY SENSOR INTERMITTENT. SWAPPED 'A' AND 'B' SYSTEM PROXIMTIY SENSOR CANNON PLUGS (LEFT GEAR UP SENSORS) PER SNL 120-032-0015. PERFORMED GEAR RETRACTION CHECK. SYSTEM OPERATIONAL CHECK NORMAL. DEFERRED 'B' GEAR POSITION INDICATION SYSTEM PER MEL 32-60-1. AIRCRAFT RETURNED TO SERVICE. MAINTENACNE SUBSEQUENTLY CLEARED DMI WITH THE REPLACEMENT OF THE LEFT GEAR 'B' SYSTEM UP PROXIMTIY SENSOR. (M)