It's surprisingly difficult to figure out what fan is what and there is a serious lack of information about it.

According to Bitmain

J12 = fan_id = 3
J13 = fan_id = 2
J15 = fan_id = 0
J14 = fan_id = 1

But I have J11, J12, J13, J14, and according to the labels on the control board

J11 = Fan 3
J12 = Fan 1
J13 = Fan 2
J14 = Fan 4



So do I assume Fan 2 = fan_id = 1 = J13 = Rear0 = bottom back?