DC power supply goes wonky

I have a 12 volt power supply that converts 110AC to 12V DC (actually 13.5.)
I haven't used it for some time.
I was using it to check some wiring and find it is now putting out 21 VDC.
???
ds


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THE WORLD WILL END TONIGHT AT 9 O'CLOCK!
(9:30 in Newfoundland.)


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