Value of a Tantalum Capacitor

Comparing a known working PSU would be great. The back of the PSU has two connectors. One has two sets of three power sockets, and one has two sets of four power sockets. It is the one with two sets of three that seems to have a short (when powered off and the subassembly carrying the connectors removed from the PSU). Looking at the connector with the component side uppermost it is the set of sockets on the left that seems to be the problem. The two leftmost sockets appear to be shorted to the rightmost of the three sockets. Looking at the backplane, the markings say that +12V is shorted to GND. From what I can see the components that connect the tracks between these sockets are: three capacitors (two ceramics and one small aluminium electrolytic), three 2W resistors, and the large Sprague capacitor (although it is hard to see this for sure). I am not sure why there would be resistors across the 12V output, unless it was to provide a dummy load to allow the PSU to work when removed? If you take the board out you I hope you will see that it is very hard to remove the heatsink to be able to see the tracks.