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On a 10 year old rig, I'd replace the lines, plus I don't know of any fitting that will correct a frayed line. You can trace which line it is and hook a connector between the old and new hose (or tape them together) to pull it thru ... however unless both lines are going to the bedroom slide, you'll have to drop part of the belly pan down to get to the fittings on the cylinder. Tractor Supply, Atwoods, most any implement dealer, or most any hydraulic shop can make your hoses. I've seen @1800 - 2000 psi as an average of max system pressure.
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