You need a Planet diagnostic. It can tell you far more about the additive system than a generic scanner.
Things to check:
There's additive in the reservoir
That the wiring is sound and clean. Also take out and re-seat the additive fuse.
That the fuel cap sensors are present
Replace glow plugs (needed duing a regen)
If the car is a 110bhp or greater there will be a DPF system on it.
Looking at the mileage I'd bet that the filter is end of life and there's little or no additive in the tank.
P3007 isn't a fault code for the MAF though, they're in the region P0101 - P0104.
As for the EGR valve, I'd probably blank it. Search "EGR Blank" on Peugeotforums.com for guides and advice.
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