What was found
A VIBRATION IS FELT ON THE FLOOR AND HEARD WITH AND WITHOUT HEADSETS AT ALL ALTITUDES AND AIRSPEEDS INTERMITTENTLY THROUGHOUT A FLIGHT. AVIONICS FAN IS SUSPECT. WHILE NLG IN STOWED POSITION, RT DOOR AFT SIDE OVERLAPPING NOSE SKIN BY .20. TRIMMED RT NLG DOOR, . CYCLED GEAR TO VERIFY DOOR CLEARANCE. CLEARANCE CHECK GOOD. ACCOMPLISHED WORK IAW MM CH. 52-10-00. WITH NLG IN STOWED POSITION, RT NLG DOOR AFT EDGE IS .18 INCH INTO AIRSTREAM. EXCESSIVE PLAY FOUND AT RT MLG DOOR.