You should find +/-15 volts and probably +12 volts an +5 volts as well as the +48 phantom supply. If only one of these is missing, check the regulator for it... most are three terminal regulators. If the one that is missing has a hot regulator you have a short someplace and this requires skill to locate Probably the fastest way is to use a thermal imaging camera... however I have often used a millivoltmeter to find where the supply drops tpo near zero. Using a "calibrated" finger and search for a hot component on the circuit board can be very effective. Likely one of the surface mounted chips has shorted. Replacing these requires skill so best leave board repair to a skilled repair person as you can easily damage the board permanently.
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