As has already been said Martyn, pulling the data is quite easy.
ACARS and related systems will already do much of what you're talking about in terms of spotting immediate "threats" to aircraft systems integrity.
The possibility of spotting trends and heading off maintenance downtime is a bit of a "complex systems" problem, and various labs around the world are working on that at the moment. I was on the fringes of one such project but backed out - not because it was a bad idea, but because I just didn't have time and good people elsewhere were working the problem already. It is very much a case of monitoring trends and interrelations in massive data sets, and as such a continuous task, rather than discrete during a turnaround.
Whilst you're thinking about this, also chat with both the airline flight data people, and your union, about their views on the confidentiality of data. There are a few pitfalls there.
G