Replacing hardware 18FRU2 Heat sink fan duct p. 623 Heat sink and fanassembly p. 624 Coin-cell battery p. 667 Cover presence switch(Intrusion switch) p. 688 Microprocessor p. 6410 System board p. 6916 Optical drive cable p. 6919 Power button board p. 6020 Card reader p. 6121 Front I/O bracket p. 5930 Storage drive cable p. 6931 Illuminated red dot cablep. 5532 Thermal sensor p. 5733 Internal speaker p. 5335 Chassis p. 6937 Wi-Fi antennas (2) p. 51