What was found
ON CLIMB-OUT, RT ENIGNE N1 VIBS EXCEEDED 4.0 IN AMBER BAND. FOLLOWED FIM 71-05-00, FIG 108, BLK 1 THROUGH BLK 5. PERFORMED TEST NR 6. ALL PARAMETERS .9 AT TAKEOFF. SUSPECT ICE BUILD-UP ON SPINNER. OPS CHECK NORMAL PER MM. AIRCRAFT RETURNED TO SERVICE.