Agilent Technologies HP 8719D Service Manual page 411

Rear Panel Assembly
11. Pull the rear panel away from the frame. Disconnect the ribbon cable
(item 12) from the motherboard connector, pressing down and out on
the connector locks. Disconnect the wiring harness (item 13) from the
motherboard.
Replacement
1. Reverse the order of the removal procedure.
14-15
Assembly Replacement and Pest-Repair Procedures