I've had the exact same fault you describe,
The recall from peugeot was to do with a waterproof cover over the abs controller i think if its had it there should be a white sticker there somewhere.
THe reason the custmomer says it feels like n/s/f is because; as i'm sure you know,that is where the pump is.
For me the only way I discovered it was to scope all 4 sensors from the connections at the pump ( i found it easier to remove bumper to do this} then drive it on the road on the car i had it turned out to be 2 sensors. One was an easy spot when the abs cut in the signal dropped altogeter the second was a dog, on the scope capture the signal only dropped out for a fraction of a second but this turned out to be faulty and problem was cured.
I think i've got the wavform saved somewhere so will try and email or post it when i find it.
hth
matt
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