By way of investigation, you could go round them with your torque wrench set to same as when you assembled it to see if they "click" at that setting.
This will at least tell you if they are holding any less tension than prior to running.
If loose, then there may just possibly be some benefit in re-torqueing them to spec.
If they all click OK, you would probably looking at replacement seals / gasket to effect a cure.
