Replacement stepsNote: Pay attention to the silk print number of each wireless WAN antenna and ensure that it matches thesilk print number of the corresponding wireless WAN antenna slot. For the location of wireless WAN antennaslots, see Chapter 1 “Meet your computer” on page 1.Bottom coverPrerequisiteBefore you start, read Appendix B “Important safety information” on page 51 and print the followinginstructions.38 ThinkEdge SE30 User Guide