Pretty much its bring the machine back to your retailer every 12 months for a service, or 6 months if you want to be really onto the maintenance side of things.
Your OPV is a commercial-quality expansion valve and will need no attention, anti-vac and safety valves should also give you a few years before the seals perish. The only thing is if you leave the machine on for long periods of time the group seal may harden quicker than normal. Otherwise, if there is no hissing or water where there shouldnt be, all is well and if it aint broke dont fix it would be my advice

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