What was found
LOUD BANG DURING INITIAL GEAR RETRACTION ON T/O FROM SJC. FOLLOWED BY EXCESSIVE VIBS. RED GEAR DOOR LIGHT ILLUMINATED. ON FRONT PNL AS WELL AS AMBER NOSE GEAR LIGHT ON S/O PNL. GEAR EXTENDED NORMALLY. PER EMERGENCY CK-OUT. UPON ARR INTO SFO, MAINTENANCE FOUND FWD NOSE GEAR DOOR CONTROL ROD END SEPERATED FROM CONTROL ROD ASSY. REMOVED AND REPLACED CONTROL ROD ASSY. OPS CK OK.