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Water pressure gaugein house

Water Pressure GaugeKit

My Febco 825Y system sprung a leak at the relief valve. I bought a repair kit and replaced the diaphragm along with all gaskets and O-rings. The bottom check valve is cracked (see photo), but that wasn't where the leak was from initially (I still plan to replace it). But now I've got leaks coming from ALL THREE valves! (see video) I'm not sure what I screwed up as I put everything back exactly as it was before. Even once I replace the cracked check valve, I'll still have at least two other areas leaking. What am I missing?