yes. i did experience this when the nut on the elbow going into the rear hydro pump was loose and the threads wore out. it created a venturi situation and hydro fluid foamed out of the vent. took a while to find/understand what was happening.
anyway, this is different.
i have flown a couple times and it seems top off is minimal now. signs pointing to missing hydro fill screw causing the issue.
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337B
Philadelphia PA
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