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Message: <blockquote data-quote="Lowe.Buuck" data-source="post: 116689" data-attributes="member: 15208">&nbspIf you are blowing that seal, then either:1. You have excessive leakage that the case drain lines are unable to handle.2. There is not excessive leakage, but a case drain line can not flow the volume due to a restriction or blockage.You could add a tee fitting at the case drain filter and install a pressure gauge.If one of those lines deteriorated to the point where a flap of rubber is acting like plug it could cause a pressure spike. I have seen rubber brake lines with this condition cause loss of brakes. The line looks fine from the outside. You would have to remove the line and carefully inspect.</blockquote>