What was found
(CAN) ENGINE NR 3, AT 22 000 FT, THE VIB. CHANNEL A + B , 2.6 TO 2.8 UNITS. ENGINE SHUT DOWN WAS CARRIED OUT PER QRH. AT TAKE OFF , THE VIB. WAS AT 2.0 TO 2.2 UNITS. ON CLIMB THE VIB. WAS 1.9 UNITS (BOTH CHANNELS), DID NOT APPEAR TO BE LINEAR WITH THROTTLE MOVEMENT. MAINTENANCE CARRIED OUT A BOROSCOPE ON THE HP & TURBINE COMPRESSORS, INSPECTED THE MAGNETIC CHIP DETECTORS AND FILTERS AND NO FAULTS FOUND. THE ENGINE WAS REPLACED FOR COMPANY CONVENIENCE WITH.