What was found
KSAN/KONT - FLT 0033 - DURING CLIMB-OUT AFTER GEAR RETRACTION, LOUD VIBRATION IN NOSE AREA. RECYCLED GEAR AND GOT UNSAFE LIGHT. EXTENDED GEAR AND LIGHTS WERE NORMAL. RETURNED TO KSAN. MAINTENANCE INSPECTED NOSE LANDING GEAR DOWNLOCK AND UPLOCK MECHANISMS AND SWITCHES. FOUND LT FIXED DOOR SEAL CAME LOOSE CAUSING GEAR DOOR TO NOT CLOSE FULLY. TRIMMED AND RESEATED DOOR SEAL.