As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
MINOR VIBRATION FELT DURING CRUISE AT FL 360 & FL380, BETWEEN .76M AND .80M. NOT EVALUATED BELOW .76M. NO VIBRATION FELT IN THE YOKE OR RUDDER PEDALS. VIBRATION ONLY FELT WITH RADAR ON. ACFT GROUNDED. PERFORMED GVI OF AIRCRAFT EXTERNAL SIDE, NO DEFECTS NOTED. COMPLIED WITH FIM 34-43, TASK 803, NO DEFECTS NOTED. CHANGED RADAR ANT DRIVE UNIT IAW AMM 34-43-11, OPS NORMAL. REPLACED RECORD ASAA2018082625922.