Lowering PS from 15 VDV to 12VDC

I finally found out the power supply requirements of my ITS 2000S. It
is +12VDC, -12VDC, +5VDC.
I found a PS that is close but puts out 15VAC and -15VDC and 5 VDC. If
I want to lower this 15 V down to 12 how would I do this? Just put a
resistor in line with it? Is it that smiple? Can someone walk me
through this so I don't fry this thing.
Once more thank you.
Russ

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