Nick, I know very well that redlines don't represent an "It will break above here" point, nor that nothing will ever break below them. Engines can fail while at idle - anything mechanical can break any time. My comment simply meant that as long as I stay below the redlines I'm legal, I don't have to shut down and write up an exceedance, and probably nothing bad will happen. I just don't want to have to read charts while flying with something close to the redline, and the N1 bias system on the S76A++ represents what I'm talking about. Just keep the N1 below the painted red line, and you're below the limits, regardless of the temperature and altitude.
As long as no red lines are exceeded, I don't have to make an entry in the logbook, and that's my main concern. I'm always prepared for something to fail, but so far, after 37 years, nothing has, and a large percentage of the 20,000+ takeoffs I've done have been at one redline or another, or at least very close to one. I keep my fingers crossed while knocking on my head, and stay ready for something to surprise me.