Ok first time I get such a fault report, if it's still 1 over several thousands, we won't get much better. This power supply has been intensively tested and I never found any issue. I think is pretty good quality.
Anyway, thanks for the feedback, and sorry for the disappointment.
If you open a case at the support desk and MP me the tick number, we may send you a replacement PSU.
Regarding the usage of an other PSU, it should be no problem.
specifications are: 12V DC, 1A minimum, and CENTER POSITIVE (the logo showing + and - positions, should match with the one on Mini>Brute's back panel)