As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AT FL280 AND 280 IAS, ACFT STARTED TO FLUTTER LIKE DRIVING ON A DIRT ROAD. NO ACFT CONTROL LOST AT ANYTIME. SLOWED ACFT AND IT STOPPED MOMENTARILY THEN STARTED AGAIN. SLOWED TO ABOUT 240 ICAS, DIVERTED, EMERGENCY DECLARED. INSPECTED ACFT AND FOUND THAT THE RT SIDE WING TO FUSELAGE FAIRING WAS UNSEALED IN SEVERAL PLACES. APPLIED SEALANT TO FAIRING IAW SRM 51-14-06.