Fruit Machine Chat

I have a Stadium power supply which has lost its -12V rail and on inspection I have a sneaking suspision its something to do with the rectification after the transformer. Unfortunately as this uses a lot of SMD capacitors for signal control and as SMD capacitors have no writing on them, does anyone have a schematic for this particular power supply so I know what capacitor to replace it with? Maybe other PSU schematics will help me to work out what on earth the capacitor value could be??

Any help would be grand as I'm stumped!