What was found
(CAN) NOTICED, FELT VIBRATION ON INITIAL CLIMB OUT BELOW 10000 FT, BROUGHT UP ENG PARAMETERS ON MFD/VIB AT 3.5/ADVSD MTC. CONTROL/VIB. INCREASED GRADUALLY TO EXCEED 4.0 THROUGH 20000 FEET. AIRCRAFT RETURNED TO DEPARTURE. ENGINE FAN BLADES WERE RE-INSTALLED. ACCORDING TO BLADE SOLUTION DISTRIBUTION. SPINNER CONE WEIGHTS MORMALIZED AND ENGINE RUN CARRIED OUT WITH GOOD RESULTS. ENGINE VIBES NOW 0.2 NO FURTHER DIFICULTIES RECORDED TO DATE. ISSUE CLOSED.