Primare I32 part idetification

Hi All,

I have a Primare I32 in my workshop at the moment that blows the mains fuse at the IEC socket.

I have visually found a six legged semiconductor mounted on a small heat sink, blown in the power supply. Component reference IC706.

Can anyone help me identify this component as the face is blown off it, and schematics for Primare equipment are virtually impossible to find online!