What was found
RAISED GEAR HANDLE AND HEARD LOUD BANG. FELT VIBRATIONS AND NOSE GEAR LIGHT REMAINED ILLUMINATED. LOWERED GEAR, DUMPED FUEL, AND RETURNED TO BASE. ****S/D***** LEFT FORWARD NOSE GEAR DOOR WAS FOUND TO BE MISSING. REPLACED LEFT FORWARD NOSE GEAR DOOR PER MM 32-22-1. ALL SHEET METAL REPAIRS IAW EA 7-5310-260945. REINSTALLED LEFT AFT NOSE (STRUT) DOOR PER MM 32-22-12.