Further to this, I just got a chance to test the PSU currently in the DM.

It is the later style 5L0565.
1 - 11.9K
2 -
3 - 53.1K
4 - No Value
5 - 22.09K
6 - 21.63K
7 -
8 - 9.11K
9 -
10 - 30.36K
11 -
12 - 8.22K
13 - 8.22K

This current PSU seems ok based on that alone.