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similar situation with a rear door. earlier this year purchased plane, it had sat and reservoir required top off. rear door drooped open and could pull until resistance. Topped off again, little drip from belly, several cycles, now holds tight tight. I have talked myself into thinking there may have been some air in system that is now worked out. Was ready to jump in and do cylinder but holding on that.
I am suspecting air got in by sitting, suction line to pumps going dry (have a '70 model with dual engine driven pumps), initial flights and slug of air got sucked in and pumped around system that is now worked out.
Did vacuum test pumps with a rig I set up to be sure pump seals not leaking and sucking in air. I think manual says something about multiple cycles (minimum 5?) to get air out of system (after work etc)....
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