Depending on the type of diagnostic card you have it's either the ExpressCard/54 slot on the side of the machine or the internal plug in ExpressCard slot on the bottom side of the laptop beneath one of the access hatches.
Depending on the type of diagnostic card you have it's either the ExpressCard/54 slot on the side of the machine or the internal plug in ExpressCard slot on the bottom side of the laptop beneath one of the access hatches.