Keysight P937 A Series Service Manual page 83

Removal and Replacement Procedures
Post-Repair Procedures
Step 13. Keying the slot configuration model number and manufacturing number.
a. Model number = Model number of the USB VNA
b. Manufacturing Number = Manufacturing number off of the label on the PXI
module. Refer to Figure 5-7 on page 70.
Keysight P937xA PXIe Service Guide 81