[R-390] EAC R390A question

[jonklinkhamer at comcast.net]

Hello Folks,
 
I'm going thru the process of restoring a 67 EAC 390A model and was looking for some information on a test point near the phone plug on the front panel. The test point is a green plastic post that does not have any wiring on it behind the panel. Although I think it did at one point since there is evidence of soldering. My reading of various postings and literature seems to indicate that it was for the diode load. Most likely the test point is more convenient in the front then back. It just seems out of place. There is no labeling above to indicate such feature and I don’t see a lot of radios with this. Can anybody shed some light?  PS: I very much enjoy this group. You guys are obviously very talented bunch. 
 
Thanks, 
Jon, KB1DC