Ign O.
Just to keep the story straight, if, "an incident with a L-1011"' is the same incident that I am thinking of, maintenance ommitted the O rings from the three MCD's when they changed them, leading to oil loss. It was not the oil caps that were left off.
New procedures were brought in so that only one per flight was changed, then after a new design such that the O ring could not be removed from the chip detector body, all three could be changed at once.
FWIW