What was found
FLT 1707, FLL-LAS. ABNORMAL VIBRATION AND LOUD HUMMING SOUND CONCENTRATED IN MID CABIN AROUND ROW 11- BOTH SIDES OF THE AIRCRAFT REPORTED B Y FA AND DH PILOTS IN CABIN - SUBTLE VIBRATION ROW 10-18; ACCOMPLISHED VIBRATION INSP TSM 05-50-00-810-801 AND IDENTIFIED SOURCE OF VIBRATION TO PANEL 191DT SEAL DAMAGE. PER TSM 53-35-00-810-801 APPLIED SPEED TAPE TO PANEL 191DT PANEL EDGES. AERODYNAMIC SEAL PLACED ON GMM SR320/321-51-001 FOR 50FC MDDR PER MCC SPEED TAPE APPLIED MX4 UPDATED. PEN