As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
TRANSITION INTO CRUISE FLT PRODUCED A LATERAL LOW FREQUENCY VIBRATION, RETURNED TO ICY. MAINTENANCE VISUALLY INSPECTED AIRCRAFT FOR DISCREPANCY, NO DEFECTS NOTED THAT WOULD CAUSE A LATERAL VIBRATION, COMPLIED WITH A OPS CHECK FLIGHT AND NO LATERAL VIBRATION WAS PRESENT, VERY WINDY CONDITIONS. ALGA (M)