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I've read of folks experience excess pressure buildup in the oiling system and it was theorised that it was due to breather valves on the aos getting stuck (but other theories were blockages as noted). in the two cases I read it manifested itself in a continuously failing aos, however (the pressure was blowing oil through the unit). there was a guy 'hospital services' or somesuch that was working it through on this forum (or pelican? can't recall).
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