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Over the years I’ve had opportunity to own a number of hydraulic dependent equipment (trucks, construction). Frequently the cause of air in a system is a leak on the suction side of the pump or at the pump itself (the seal). My model uses engine driven pump and is known seals can go out leading to sucking of air. I believe your model uses Electric power pack. You might want to run the problem by one of the power pack overhaul shops (like cox airparts).
Yes, lines don’t last forever, can break down, leak and regarding the “microperfs”, “sweat“ fluid as they leak. However the lines are under pressure and thus unlikely to be a source where air is sucked in.
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