dbx286s Schematics

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Does anyone know where to find the schematics for a dbx 286s microphone processor? I have the schematics for the dbx 286a. They are not the same. A friend wants to convert a dbx 286s to +13.8 VDC operation for mobile use. It seems that the power supply is just a ±15V supply (not including the phantom power supply) which can be supplied by a dc-to-dc converter that may be able to be mounted inside the case.
 
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