Behind the driverseat and next to the Flux Capacitor you will find 2 gold heatsinks

The PCB fills the entire length of the radio and had 2 holes in the front 

Below is the gold heatsink that we have made out of extruded aluminium and then gold anodized

The heatsinks seem to come of (or at least close to a) Contraves PC0598B Power board (Thanks to Michael Lerra for the pics)