What was found
TWENTY MINUTES INTO FLIGHT FROM MIA, LANDING GEAR DOOR NOT LATCHED LIGHT ILLUMINATED. COULD NOT EXTINGUISH LIGHT, AIRCRAFT RETURNED TO MIA WITHOUT INCIDENT. MAINTENANCE TROUBLESHOOTING DETERMINED MLG DOOR 'J' HANDLE TO BE INTERNALLY BYPASSING (MLG DOOR CONTROL VALVE). REMOVED AND REPLACED VALVE. OPS CHECKED NORMAL. (M)