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With luck just the flame trap problem. 850s have flame trap instead of PVC valve. Should be changed about every 30k miles, althought mine has been know to get a little clogged after 20k and I'm pretty good about changing oil & filter.
When clogged crankcase pressure builds up and has to go somewhere, with luck, now that pressure is relieved the oil will stop leaking and there is no long lasting damage. Had a friend who was telling me about server oil leaks in his 740. Replaced flame trap and leaks gone.
Also, gasket on oil filler cap is commonly needs replacement if you find oil near there.
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