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There is no need to change the tubes unless one of them is cracked. They are totally inert in their function... just swap the 'o' rings...and ONLY if they're needed.
I'm of the school that when it comes to gaskets and seals, if they're not leaking, leave them alone.
Some want to change them as a matter of convenience 'since I'm already in there'.
But the odds of pinching an 'o' ring and not getting a proper seal on one of the 12 'o' rings is much higher while lying on your back, working at arm's length in poor light as compared to when Hans (or Mohammad or Mika) installed them on a bench in good light during the engine assembly.
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