What was found
DURING CLIMB-OUT, FLIGHT CREW REPORTEDLY HEARD A LOUD POP SOUND FROM THE NOSE WHEEL WELL AREA. FLIGHT CREW FOLLOWED COCKPIT OPERATING PROCEDURES. CYCLED LANDING GEAR, RETURNED TO ORIGINATION, AND LANDED WITHOUT INCIDENT. MAINTENANCE REPLACED THE LEFT NOSE LANDING GEAR DOOR, NOSE GEAR UPPER COIL, CABLE, AND SPRING. OPERATIONAL CHECK OK.