Notable is that on the PSU connector side, 5 pins show heat damage. That means at minimum those 5 must have been carrying some current; i.e. only one of the 6 connections could have failed completely open.
On the PSU one of the ground pins was melted into the PSU connector, this should allow verifying if the plug was fully inserted by a lab disassembling and cross-sectioning it.
Notable is that on the PSU connector side, 5 pins show heat damage. That means at minimum those 5 must have been carrying some current; i.e. only one of the 6 connections could have failed completely open.
On the PSU one of the ground pins was melted into the PSU connector, this should allow verifying if the plug was fully inserted by a lab disassembling and cross-sectioning it.