That is probably a dead pixel causing the line.
I had one like that on a S2 CCD sensor and I sent a RAW file to Leica and they mapped a correction, sent me a Firmware update to install. Took 5 minutes and it was gone.
I think even new sensors are mapped for any dead pixels.
Unless the sensor is corroded (which is a different issue), I doubt they'll replace the sensor, nor does it need to be replaced.
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