[R-390] 4 R 390a with same issue

[mparkinson]

Strange I have checked the wiring and controls compared to a known working R 390a receiver still have this weird issue.
The line level output control is turning the Local audio up and down. 
Now the strange part the Local audio control is adjusting the line output on the line level meter. 
This should be straight forward trouble shooting Right.???? 
This is the 4 receiver I have come across having the same issue audio  deck has been swapped out no change the wiring harness looks ok 
compare to another known working radio. 
This one has me stumped for now.   
Anyone with some good Ideas ???
At first I thought is was some Military type mod maybe for the Navy on board ship deal. 
No sure now. 
Matt P 

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