[Raymond and Koji]
We dunked the PD socket test piece into LN2 and repeated heat cycle 8 times. No obvious change was observed. Then the wires were pulled to find any broken joint or etc.
None of the solder joints showed the sign of failure.
For cleanliness, we are going to use In-Ag solder (no flux) for the actual wiring.
Attachment 1: Frozen connector
Attachment 2-4: Inspection after thawing.