[Elecraft] KPA 100 Test Question

[kevinemtid @tvcconnect.net]

Hi Folks, I am testing a newly built KPA 100 with my K2. Upon power up, I
hit the Display key and get the following: Elecraft (normal message) then
S1 nr nt. Can anyone tell me what this means?  Is this supposed to be a
trouble shooting code 51?

I would like to know before I proceed any further in my testing.

Thanks and 73,

Kevin NZ1I
K2 # 7362