Node front FAN module A3 attention LED on without any error. Fan1_1 normal 7900 RPM 600 RPM 900 RPM -- -- Fan1_2 normal 7900 RPM 600 RPM 900 RPM -- -- Fan2_1 normal 7900 RPM 600 RPM 900 RPM -- -- Fan2...Node front FAN module A3 attention LED on without any error. Fan1_1 normal 7900 RPM 600 RPM 900 RPM -- -- Fan1_2 normal 7900 RPM 600 RPM 900 RPM -- -- Fan2_1 normal 7900 RPM 600 RPM 900 RPM -- -- Fan2_2 normal 7900 RPM 600 RPM 900 RPM -- -- Fan3_1 normal 8000 RPM 600 RPM 900 RPM -- -- Fan3_2 normal 8000 RPM 600 RPM 900 RPM -- -- Fan4_1 normal 7900 RPM 600 RPM 900 RPM -- -- Fan4_2 normal 7900 RPM 600 RPM 900 RPM -- -- Swap FAN module with B3 then attention led of B3 turn on.