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I missed that you have a burger intake. That can through off your airflow readings from your MAF (unless you tuned for it) since the cross section and aiflow characteristcs are different than the stock intake pipe. I don't think it throws it off much, some people get codes and issues from it, others don't. But it's good for you to keep that in mind.
The sensor in the burger intake is the MAF (mass air flow) sensor, and the ones in the charge pipe and intake manifold are both TMAP's. Per realoem, the charge pipe TMAP and intake manifold TMAP are the same.
Boost leak is a really good idea. The description in that 280e code about pressure too high during coastdown seems suspicious to me though. Does "during coastdown" mean in overrun (foot off the gas, but still in gear and coasting)? I wouldn't expect a boost leak to cause excess pressure in overrun? That and the codes about errors with the absolute pressure sensor make me suspect something with one if the TMAP's. Hmmm, not sure how to check this without just swapping them, but if the connectors for your two TMAP's got swapped, then your DME would think there is too much pressure in the manifold during overrun because that sensor should be behind the throttle plate and seeing vacuum. Another cause could be that blow off valve not opening properly, but I doubt that since you said you can hear it venting.
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