What was found
AFTER TAKEEOFF ENGINE 1 VIBRATION WAS AT 3.9 COMPLIED WITH QRHDECENDED AS REQUIRED. WHEN REACHED 12K FEET IDLE POWER, VIBES RETURN TO THE NORMAL RANGE. DECLARED AN EMERGENCY DID NOT LAND OVERWEIGHT (FLIGHT 4290 - FILED CLOSED) INSPECTED THE LH ENGINE FAN BLADES FOR STIFFNESS IN REF TO CRJ 550 AMM 72-21-02. NO DEFECTS NOTED. PERFORMED ENGINE VIBRATION CHECKS IN ACCORDANCE WITH AMM 71-00-00-720-806. LH ENG SHOWED .4 AND RH ENGINE SHOWED .6 AT POWER. OPS CHECK GOOOD; AIRCRAFT GOOD FOR SERVICE. MCO CREATED FOR FURTHER T/S FOR HIGH TORQUE PINS IN 15 FC OR LESS.