What was found
CREW REPORTED LEFT GEAR INDICATION INOP - 60 AROUND PERFORMED - MAINTENANCE CONTACTED. EQUIPMENT CALLED FOR - COORDINATED APPROACH END OBSERVER WHICH CONFIRMED GEAR APPEARED DOWN - LANDING MADE WITHOUT INCIDENT. MAINTENANCE RE-LAMPED LEFT MAIN GEAR DOWN LIGHTS. OPS NORMAL. PERFORMED PRESS-TO-TEST FOR WARNING LIGHTS, FOUND BOTH LAMPS BURNED OUT IN LEFT GEAR GREEN DOWN LIGHTS.