What was found
ON FLT NR 517 - ATL-ATL - AIR RETURN, ON GEAR RETRACTION ALL LIGHTS WENT OUT, ON UPLATCH CHECK GREEN LIGHT ON, DOOR LIGHTS CLOSED. GEAR CYCLED AND NOSE GEAR INDICATED UNSAFE. RECYCLED AND ALL LIGHTS GREEN. FOUND LEFT GEAR UPLOCK TARGET MISALIGNED WITH RETENTION SPRING. REALIGNED RETENTION WITH TARGET AND ADJUSTED NOSE GEAR LOCK SENSOR TARGET. REPLACED PROXIMITY BOX AND LANDING GEAR LEVER RELAYS AS PRECAUTIONARY. OPS CHECK NORMAL. (M)