hifi engine

Service manual / schematic for Polk Audio PSW125 powered subwoofer

Does anyone have a schematic for the Class-D amplifier portion of a Polk Audio PSW-125 powered subwoofer? I am trying to fix a friend's unit and it keeps blowing fuses, but I cannot see any catastrophic markings. I think an output FET in amp is toasted, but I need a detailed parts list to determine a replacement. If anyone has any info, that would be awesome!