I read about that test as a precursor to ordering they're kit. I haven't pulled the EWS but I'll try this before I take the head off and go down the compression route, and after I see what the nt710 tells me.

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Donald Foss
2003 E53 3.0i, 5L40e (for now)
- self-rebuilt engine, valves, SL oil pump
- ported heads, both sides
- N55 intake manifold, 70 lb injectors
- GTX 2860R-clone 60mm top-mounted turbo
- progressive slip diff
- under chassis cats
- extra sensors wired to Arduino
- 15" touch screen dash-mounted