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Update:
Diagnosis, no codes, no idea.
Confirmed she has a new fuel filter, air filter, MAF sensor, cleaned MAP sensor, new boost solenoid, new airlines, and we have cleaned the hoses thoroughly. Done everything conceivable in the boost lines.
Another point: My other half recently found a Nissan Patrol for sale, with a boost problem. He made contact to ask about the boost problem - they don't know whats wrong, that's why it's being sold.
AND my mechanic who did the testing had another one in only two weeks ago and they didn't resolve that problem either.
I shall contact the local Nissan dealership and talk to one of their mechanics to see what I can learn. Next step will be collecting information on a thread for others to add to until we find the solution.