I've never had this happen, but I am curious to know something. Let's say you discover a minor coolant leak into your oil supply, or vice-versa. Does retorquing the head ever fix such an issue, or is it already too late? I ask because even after ~30 years of 105/115 Alfa's, I simply don't retorque head bolts unless I'm installing a new head. I know the bolts in my '74 haven't been touched since I've had the car ('97), nor have the ones in my '87 ('01), and my '92 I've still had less than a year. last time I had a head gasket fail was '79, in the middle of January in single digit temps, although I moved to the hot south soon thereafter. I'm always careful with engine warmup and keep the revs low until normal operating temp.
Is retorquing the head bolts maintenance, repair, or both?