xserve raid midplane(?) troubleshooting help

LIttle Update in case it would help someone with more knowledge of this than I:

When the Controller is in the lower position:

or

which I find interesting since I don't have an upper controller installed and the cooling modules both show as missing even though they exist (though 1 is failed).

If I look at the other tabs:

Info: Shows only Name: XServe RAID and Power State: On

Arrays & Drives: Shows Not Installed for all drives on that side of the XServe RAID

Fibre Channel is blank as I don't currently have it connected to my XServe

Events shows nothing of significance to me other than all disks online

When the controller is in the upper position however:

I am curious as to why the RAID controller shows as present in both slots when it clearly is not however.

Hoping it was just a cable from the midplane to the unit, I swapped cables this morning hoping for a failure, but did not get such failure, so I have ruled out the cable. The Controller seems to work when it is in the top slot, so I think that the controller is likely good as well. So I guess I can sum it up as:

Power supplies: Good x2, shows a green light in either slot, swapped in testing

Batteries: Good x2; Swapped in testing, Swapped in testing, works in upper slot, does not in lower slot

Cooling Unit: Good x2; Swapped in testing, works in upper slot, does not in lower slot

Controller: Good x1; works in upper slot, does not work in lower slot

Which leads me back to the midplane as there isn't much else inside this unit that I can see that could go wrong. Does this sound like an accurate assessment? I ask because I want to be confident I have found the issue prior to ordering a new backplane.

Once again, thanks in advance for any information.

Update to my thread in case anyone else happens to experience this.

Replacing the midplane worked like a charm. Very simple to do as well. Cost me about $45 to order a refurbished one online, and about 10-15 minutes of time to replace it