HP 158A Motherboard Diagram

[UltraNoob]

I recently purchased an HP Z620 WORKSTATION.   When I go to the HP Support website, I can find the manual for my computer, but I am having a problem finding my exact motherboard diagram (HP 158A) with the removeable second CPU board.  I am really trying to locate {IF}, and {WHERE}, on the motherboard is the M.2 slots are loacated.  There is a basic diagram in the manual but nothing in great detail.  Since this is a new purchase I got off ebay, I would like to be able to take a look over the motherboard to see all the features, locations of items, and special performance instructions specifically for my motherboard.   If there is someone who can help me navigate to the proper source, please help.  Thank you in advance. 

Note:  my goal is to turn this old server pc into a computer for music production in the studio.  I plan to use the HP Z620 as the master with two slaves, connected by the Network RJ-45 ports, but I will need to upgrade to SSD hard drives and possibly SATA or PCIE SSD hard drives.  

[REO51ST · Accepted solution]

@UltraNoob

https://h20574.www2.hp.com/results.htm?SID=5225037&MEID=252A1AE9-5ACE-4CF6-8DF2-4D00FFBADF21

Click on Internal.

Then Internal View #2.

Then System Board.

This may help.

HP Z620 Workstation - FRU Remove/Replace Videos

https://h20574.www2.hp.com/results.htm?SID=5225037&MEID=456D75EE-2A00-4C27-8AB5-6436D07B49DF

REO

[UltraNoob]

Thanks a million times......  How did  you come up with that navigation path?