What was found
LOUD 'BANG' EXPERIENCED AFTER GEAR RETRACTION. ONCE GEAR WAS SAFELY UP, NOISE AND VIBRATION WAS NOTICED. AIRCRAFT RETURNED TO SAN. INSPECTED AND FERRIED AIRCRAFT TO ONT. JACKED AIRCRAFT, FOUND RT NOSE GEAR DOOR FORWARD LINK UNLATCHING. REMOVED AND REPLACED LINK ASSY, AND PERFORMED RETRACTION CHECK IAW DC 8 MM CHAPTER 32. SYSTEM OPS CHECKED GOOD.