What was found
DESCENDING THROUGH FL260. PILOTS HEARD A LOUD HIGH FREQUENCY VIBRATION IN THE COCKPIT. AIRSPEED WAS 305KTS. LEVELED OFF AT FL200, SLOWED & VIBRATION WENT AWAY BELOW 290KTS. SPED UP ABOVE 305KTS, VIBRATION RESUMED. INSPECTED THE LT & RT WING-TO-BODY FORWARD-FAIRING SEALS. NO DISCREPANCIES. INSPECTED WING-TO-BODY FAIRING NACA AIR-INLET POLYURETHANE FILM. NO DISCREPANCIES. INSPECT FUSELAGE DRAINS. NO DISCREPANCIES. R & INSP LT & RT COWLINGS. NO DISCREPANCIES. INSPECTED LT & RT UPPER & LOWER PYLONS. FOUND EROSION TAPE ON THE RT UPPER PYLON DAMAGED. WORK PERFORMED IAW AMM 05-50-27.