After gathering your FA findings below, can you please help to measure the scew#1 pad height on the MBA base as extracted and attached below. For sanity check also measure screw#5 as indicated in below diag and the PCBA corresponding mating interface at screw#1 and 5 region.The hypothesis is pad height may be on the low side not giving enough support to the PCBA grd donut pad when screw#1 tightened down inducing a warpage stress around the area near SOC.Hypothesis based on below points:-Followed PCB Port A path correspond to SOC-Loosen screw#1 passed and tightened failed-Stress induced may have caused some intermittent contact defect in the SOC or neighboring components to propagate overtime, and that's why when swap both case PCBA and HDA CND and when match back failure can be repeated. And failures can be repeated by swapping among failures.-Do take note of the material supplier, d/c and related manufacturing info to identify any trend if we believe this is batch related