Audio Precision Portable Plus Residual Noise errors

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Hi,
AP portable 1+Fails self test on 7.0a and 7.1b, residual noise test for L+R respectively.
Limit is 1 uV and it's showing 3uV. I remember reading somewhere that this is caused by stray noise or environmental but I just can't recall. Thinking of taking a change and purchasing but it appears service manuals are scarce. V1.0 firmware also.
Anyone familiar wit this model? Opinions?

Regards, Jim
 
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