What was found
CREW REPORTED GEAR DISAGREE WARNING MESSAGE DURING FLIGHT. LEFT GEAR SHOWED DASHES. MANUAL RELEASE WORKED NORMALLY. RETURNED TO FIELD AND LANDED WITHOUT INCIDENT. MAINTENANCE TROUBLESHOT AND FOUND PROXIMITY SENSOR ELECTRONIC UNIT FLAGGING LEFT LANDING GEAR UPLOCK SENSOR AND FOUND TARGET GAP OUT OF RIG. MAINTENANCE ADJUSTED SENSOR GAP AND PERFORMED CHECKS PER AIRCRAFT MAINTENANCE MANUALS. AIRCRAFT RELEASED FOR SERVICE.