Most likely the additional port on the wastegate actuator. There are two ports and if you are using an EBCS in interrupt mode, one port is blocked/capped off. That cap likes to fail and cause boost creep. On my CST4 I just removed that extra barb and screwed bolt in there with some thread...
Mind if I ask where on God's green earth did you find the lights for the climate controls? I've been looking all over the internet for them and cannot seem to find them.