Chris - I recall seeing some of your other posts regarding your dilemma but i don't remember all the details. You mention "the alda function and the presence of boost at port" Does this mean to say you've actually removed the ALDA and given it a test drive? I had something similar and I ultimately found a blocked line and non-functioning ALDA. the remove and drive test is definitive and actually about the easiest I guess. If you've already done that then sorry to waste your time reading this.