What was found
CREW DECLARED AN EMERGENCY DUE TO GEAR DOOR OPEN LIGHT REMAINING ILLUMINATED AFTER GEAR EXTENSION. EXECUTED A GO-AROUND AND PERFORMED ALTERNATE GEAR EXTEND PROCEDURES IAW THE QRH. FOUND A MISSING BOLT, ECCENTRIC, AND SHEARED BRACKET THAT HOLDS THE TARGET. ALL MISSING, OR DAMAGED, REPLACED AND THE GEAR OPERATION CHECKED GOOD.