How to replace the fan in the HP J6000?

Hi all,

it is me again..now my HP J6000 fan is spoilt. Based on the error, i suspected it is Fan 1 in the power supply, however there is 3 fans in the power supply, how do i know which is Fan 1?

Thanks for your response

regards

Can't you see/feel them running?

no, i can't feel or see the fans as they are facing inwards and if the server cover is removed for visual inspection (to see which is the problematic fan), the fans will not turn (machine unable to power up).