Module testing issues

Hi I am testing module SN: 20UPGM22110495 that was assembled at MPP. There were quite few issues while testing the module: 1. On powering ON the module, the Vin was recorded with the multimeter and instead of a nominal value of 1.69 V, it was recorded to be -1.184V. Not sure why we observe a reverse polarity: we checked the wirebonds and everythings seems correct even with the Iref trim bits. 2. With eyediagram executable, it was noticed that one of the chips failed with the data-link quality, as a consequence of which also failed the e-fuse test. 3. With IV measurement of the module, as you can see in the attachment here - https://uuapp.plus4u.net/ucl-itkpd-maing01/dcb3f6d1f130482581ba1e7bbe34413c/testRunView?id=667943d3adfd0f0035456527, that the current value when normalised to 20C is close to the sensor tile data, with no early breakdown observed. However, the modules still fails the QC criteria. 4. on performing ADC calibration, it was noted that we get the following error: DEBUG:measurement:[yarr] configure module Done. Done. ERROR:measurement:Reading Vmux30(Imux63) (ground) through ADC gave '11', '0', '0' counts - when it should be 0(0)! Please check. ERROR:module_qc_tools.cli.ADC_CALIBRATION: Traceback (most recent call last): File "/home/itklab/.local/lib/python3.7/site-packages/module_qc_tools/cli/ADC_CALIBRATION.py", line 235, in main run(data, adc_calib_config, ps, yr, meter, layer) File "/home/itklab/.local/lib/python3.7/site-packages/module_qc_tools/cli/ADC_CALIBRATION.py", line 81, in run check_adc_ground(yr, adc_calib_config) File "/home/itklab/.local/lib/python3.7/site-packages/module_qc_tools/utils/misc.py", line 76, in check_adc_ground raise RuntimeError() RuntimeError What could this be associated to? I checked the connection to the Vmux pins of the data adapter card and everything seems fine.