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I see you still have 13.8 volts between the positive and negative terminals.
Shorted cap, possibly
May be same cap your friend replaced.
Positive terminal shorted to -11 Volts below protective ground?
Negative terminal shorted to -25 Volts below protective ground?
I don't understand a solution to these results.
I do enjoy troubleshooting and brain teasers.
What model PS do you have and do you know of an on-line schematic.
If not, I don't think I can help any further.