What was found
FOLLOWING MAJOR MAINTENANCE AIRCRAFT DEPARTED AIRPORT. UPON GEAR RETRACTION THRUST REVERSER UNLOCKED LIGHTS ILLUMINATED. EMERGENCY STOW SWITCHES WERE DEPRESSED AND AIRCRAFT RETURNED TO AIRPORT WITHOUT INCIDENT. INVESTIGATION REVEALED MLG SQUAT SWITCHES WERE ADJUSTED IMPROPERLY DURING MAINTENANCE EVENT. AIRLOAD ON LANDING GEAR CAUSED MALFUCTION IN FLIGHT. SWITCHES WERE READJUSTED PROPERLY. UNEVENTFUL FLIGHT WAS CONDUCTED FOLLOWING ADJUSTMENT. TO PREVENT RECURRENCE MAINTENANCE PERSONNEL SHOULD FOLLOW FULLY THE SWITCH ADJUSTMENT INSTRUCTIONS IN THE AC MM. (NM03200504817)