VacuFluh J Series tank leaking air - 2022

We did some work on the sanitation system. Namely the J Series vacuum tank by VacuFlush (now Dometic VG4 Vacuum Generator, 12 V). It has had a small air leak in it for some time now. November 2022 - s/v Elegant'sea is currently in Paradise Village Marina in Banderas Bay Mexico (by Puerto Vallarta)

 Still works but it is worrisome. We pulled out the pump then replaced some seals and duck bills and fittings. Still no love. Later in the week I will pull it apart again and change the piston and some seals and plastic brackets etc. If that does not do it then I will need to pull the whole tank and remove the top etc. It is a big-time consuming job. Have done it before once. It is over ten years old now.
We are looking to replace the system with a Dometic MasterFlush MF 7160 series with a macerator. It also has a household size bowl. At the time we put this in it was the only toilet that would fit our space with a household, bowl but they have since came out with the Dometic MasterFlush MF 7160? which has a swivel macerator so it can fit in tight spots. Anyway, I like the household size bowl and we like to use fresh water for flushing.

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