What was found
DURING FLT, VIBRATION FELT IN CONTROL COLUMN. HIGH FREQUENCY VIBRATION STILL FELT AT 250 KTS-270 KTS. VIBRATION MOST PRONOUNCED WHEN BANKING LEFT; ESPECIALLY WHEN RIGHT BANK ESTABLISHED, THEN LEFT CONTROL (ROLL) INPUT ENTERED. AIR RETURN TO MEM. WHILE REDUCED HIGH FREQUENCY VIBRATION STILL FELT AT 250 KTS-270 KTS. VIBRATION MOST PRONOUNCED WHEN BANKING LEFT; ESPECIALLY WHEN RIGHT BANK ESTABLISHED, THEN LEFT CONTROL (ROLL) INPUT ENTERED. MAINTENANCE INSPECTED LT TRAILING EDGE SEAL, FOUND IT NEEDED SOME ADJUSTMENTS TO 3 OF 5 SECTIONS. INSPECTED ROLL SPOILER ACTUATORS & ROD ENDS ALONG WITH CABLES TO BOTH LT & RT SIDES, ALL CHECKS GOOD. A/C NEEDS TEST FLIGHT FOR SLIGHT VIBRATION CHECK.