As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
VIBRATIONS AT 27,000 FEET AT 320KTS. FELT AS FROM THE RUDDER. FELT IT ON THE RUDDER PEDALS. SLOWED DOWN TO 305 KTS AND VIBES WENT AWAY.-ACCOMPLISHED TSM 05-50-00-810-801-A. FOUND MULTIPLE BELLY PANELS MISSING FASTNERS. INSTALLED FASTNERS IAW AMM 53-35-11. FOUND WATER SERVICE DOOR NOT LATCHED. SECURED SERVICE DOOR CLOSED IAW AMM 52-42-00.