Upstream 448 (Kbps.)
Downstream 2848 (Kbps.)
Operation Data Upstream Downstream
Noise Margin 20.0 dB 1.3 dB
I would ask them to up your noise margins,
With an attenuation of 48dB you really don't want the SNR dropping to 1.3dB
As others have said try going in to the test socket and checking the line stats then.
Leave it in the test socket for 72 hours and monitor the noise margins.