What was found
AT 100 FEET AGL THE CREW RETRACTED THE GEAR AND THE LEFT HAND GEAR INDICATION REMAINED IN TRANSIT. THE CREW CALLED MAINTENANCE CONTROL AND STATED THAT WHEN EXTENDED THE INDICATIONS SHOW ALL DOWN. MAINTENANCE CONTROL HAD FLIGHT 9405 RETURN TO DAYTON WHERE MAINTENANCE ADJUSTED THE UPLOCK PROXI SENSOR IN ACCORDANCE WITH DORNIER MAINTENANCE MANUAL 32-00-00. OPERATIONAL CHECKS WERE PERFORMED AND THE AIRCRAFT WAS RELEASEDFOR SERVICE.