What was found
(CAN) SHORTLY AFTER T/O, THE RT ENGINE VIBRATION INDICATOR FLUCTUATED ERRATICALLY THE WENT TO DASHES MOMENTARILY THEN RETURNED TO NORMAL OPERATION. FLIGHT RETURNED FOR MAINTENANCE TROUBLESHOOTING. AFTER CHANGING THE ENGINE ACCELEROMETER AND SIGNAL CONDITIONER WITH NO FIX, THE ENGINE VIBRATION HARNESS SHIELDED WIRE WAS FOUND CHAFFING AGAINST ENGINE CLOSE TO THE ENGINE DISCONNECT PLUG. THE VIBRATION HARNESS WAS REPLACED AND THE AIRCRAFT WAS FUNCTION CHECKED SERVICEABLE. (TC NR 20070423004)