avalon 2nd generation keeps shorting the psu 12v rail! HELP!

hi all,

I replaced all the blown caps on the 2 avalon project boards with Panasonic 470uF 25V 105 degrees low ESR electrolytic capacitors:

*I CANNOT INSERT IMAGE!

Now every time I switch on the unit the 12v rail is shorted on the psu.

Does anyone know what the problem is? Are the caps wrong?

The original caps are here:

*I CANNOT INSERT IMAGE!

I also would like to know if I can replace the chips on the boards which have burnt?

I think that these chips say cs016321 1248p mtsm7 but I have been unable to locate them anywhere - Can anyone help please?

Also, I have an smd blower so would I be able to put a second cs016321 1248p mtsm7 chip side by side with the original? I am thinking that this might reduce the single chips temp and prevent burning?

Any advice greatly appreciated