What was found
GEAR DISAGREED, ON GO AROUND, GEAR LOCKED INTO PLACE. GEAR LEFT DOWN AND CIRCLED AROUND TO LAND. NO EMERGENCY DECLARED. AIRCRAFT WAS GROUNDED. MAINTENANCE ACCOMPLISHED TSM 32-31-00-810-808, AND 32-31-00-810-836. NO FAULTS FOUND. ACCOMPLISHED EIGHT SUCCESSFUL GEAR SWINGS. REPLACED THE NR 1 LANDING GEAR CONTROL INTERFACE UNIT IAW AMM 32-31-71, AND PERFORMED SATISFACTORY OPERATIONAL CHECK.