So my factory navigation screen is starting to show white lines on the screen, my question is: have it repaired or toss the whole thing and go with a new setup. The PO upgraded the front door speakers to pioneer’s, and an Aux input. I'm still running the factory amp non-DSP, and I have BT. I don’t have a Sub or XM radio which I would like to add in the future.
So please chime in:

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2004 996 anniversary
2004 R1150R
2006 X5 3.0
2013 C300 AMG Sport