As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AFTER RAISING LANDING GEAR ON T/O EXPERIENCED VERY LOUD VIBRATION IN NOSE AREA. SLOWED DOWN PUT GEAR DOWN AND NOISE DECREASED MAX SPEED 200 KTS VIBRATION VBS. STILL BAD AT 160 KTS. RIGGED NOSE DOORS PER M/M. CYCLED GEAR SEVERAL TIMES, ALL INDICATIONS NORMAL. OK FOR SERVICE.