What was found
DIVERSION, NR 2 ENG HIGH N1 VIBRATION ON CLIMB AT 36,000. KEPT OUT OF YELLOW BAND BELOW 67% N1 POWER SETTING. POWERPLANT ENGINEERING REVIEWED ECM/OCM DATA. CLE LINE MAINTENANCE REPORTED THAT ICE WAS FOUND ON THE SPINNER AND FAN BLADES. POWERPLANT ENGINEERING DIRECTED MAINTENANCE TO CARRY OUT TROUBLESHOOTING IAW FIM 77-31 FT 807 FOR HIGH VIBRATION. AS WELL AS INSPECT THE SEAL AROUND THE SPINNER. PER CLE LINE MAINTENANCE, NO FAULT WAS FOUND AFTER COMPLETION OF THE FIM, LEADING TO ICING LIKELY BEING THE ROOT CAUSE.