What was found
FLT 522 - HNL - AIR RETURN, UPON FLAP RETRACTION CLIMBING OUT OF APPROX 2000 FEET, A LOUD METALIC SOUND ORIGINATING FROM BELOW COCKPIT CREW AREA WAS HEARD AND FELT. FLIGHT ATTENDANT ALSO HEARD AND CONFIRMED. AFTER CREW DEBRIEFING MLG WAS RETRACTED AND FLAPS WERE ALSO RETRACTED. INSPECTION OF NOSE GEAR REVEALED NOSE GEAR RETRACT ASSIST DOOR SPRING BROKEN. REPLACED NOSE GEAR RETRACT ASSIST SPRING PER MM 32-21-3. SECURITY AND CONDITION CHECK OK. NO DAMAGE TO HYDRAULIC LINES AND OTHER COMPONENTS. SECURED NOSE GEAR DOORS. (M)