What was found
DURING CLIMB-OUT, ALL THREE GEAR DOORS OPENED ACCOMPANIED BY GEAR DOOR OPEN LIGHTS. AIRCRAFT RETURNED TO BUF. WHEN GEAR WAS SELECTED GEAR DOWN, GEAR DOWN AND LOCKED INDICATORS DID NOT SHOW GEAR DOWN. ALTERNATE GEAR EXTENSION DID NOT INDICATE DOWN AND LOCKED. RECYCLED THE ALTERNATE GEAR INDICATION CIRCUIT BREAKER AND ALTERNATE EXTENSION INDICATED DOWN AND LOCKED ON ALL THREE GEAR. CAPTAIN ASKED FOR EMERGENCY EQUIPMENT TO STANDBY AND AIRCRAFT LANDED WITHOUT EVENT. T/S REVEALED BAD PSEU. LOOSE SCREW CONTACTED AND SHORTED LOGIC BOARD. NOTE THAT SCREWS SECURING THE HANDLE COME FROM INSIDE WITH THE NUT ON THE OUTSIDE. (M)