What was found
CREW REPORTED VIBRATION AND RUMBLING AT RIGHT SIDE OF MID CABIN AREA. STARTED AROUND 320 KTS. RETURNED TO DUS. ETOPS. *S/D* SEQ NR 3272003: CREW FELT AND HEARD NOISE; SUGGESTED LOOSE EXTERIOR PANEL. A/C CK'D FOR OPEN OR LOOSE PNL, DOOR AND LNDG GR DRS, FOUND OK. AC PACKS AND EXHAUST CK'D GOOD, NORMAL OPS. NOTE SEQ NR 6672006 (11/03/97): NR 2 ENG HIGH VIBRATION FELT IN AIRFRAME OR THROTTLE AT HIGH PWR. INSPECTED INLET/EXHAUST, NO DISCREPANCIES. CHIP DETECTORS CHECKED. ENGINE VIBRATION WITHIN LIMITS PER MMOV 77-31-00. ORIGINAL INSPECTIONS FOUND NO PROBLEMS. A/C HAD NO RELATED PROBLEMS FOR 24 DAYS. NO RELATED PROBLEMS FROM 11/03. ISOLATED INCIDENTS, NO FURTHER ACTION.