Most manufacturers do not supply schematics for any of the systems. At the most you may find a basic generic sketch that applies to many models. Also, on that old of an RV, you do not know if previous owners have made modification to the plumbing and electrical.
Good luck with the repairs.
Ken
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Amateur Radio Operator (KE5DFR)|No Longer Full-Time! - 2023 Cougar 22MLS toted by 2022 F150, 3.5L EcoBoost Tow Max FX4 Lariat Travel with one Standard Schnauzer and one small Timneh African Gray Parrot, retired mechanical engineer
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