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Please help me get my irrigation system working again

I have an existing irrigation system but it’s got blockages, leaks and some of the tubing is laid down the wrong side of the garden and I’d love it if all the right plants got watered. I’d love someone who has the patience and experience to sort my irrigation out please. There are three main irrigation lines. One line feeds the lawn sprinklers which look ok although one has sunk quite low. The other two lines feed spray outlets around the front and rear garden.