hifi engine

Polk Audio DSW Pro 500 subwoofer

The input switching power supply is bad - R4 vaporized (near U1 - VIPER12 AE) - does anyone have a schematic or can you suggest a replacement power supply. It's made by Kwang Sung Electronic - KSP - 5085(1) - for DSW 500 (150W) 04-A-0PbF.
Skal!