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20948076-AE1F-415A-8778-689B21BA3B3A

@SHEPLMBR so the floats are tied to the pipe? Isn’t that pipe in the water supposed to be connect to the pipe pointing downward?
20948076-AE1F-415A-8778-689B21BA3B3A

That just looks to be a "float tree".
20181202_101523

probably been leaking from day one. Did the installer solder any joints? flux can act like an acid and cause premature corrosion if he had a some on his hand when he installed the flex.
Gasline

Well, that looks like a dishwasher drain hose to me. Trace it out and see where it goes. A CSST gas line is about that size and shape, but that kind of gas line has a yellow cover will feel solid...
Inline water filter

shut valve off to filter loosen compression nut on valve and pull plastic hose out. where copper line goes into filter it should be a push fitting. push down on plastic around copper with needle...