Fujitsu SPARC ENTERPRISE M9000 Service Manual page 307

If the lever of a PCI cassette cannot be inserted:
■
a. When the lever of the PCI cassette is pushed in but it stops halfway without
reaching the far end, do not forcibly push it in any further. Instead, pull it
out once and then insert it again.
Reinserting the Lever
FIGURE 13-11
Chapter 13 PCI Slot Device Replacement 13-15