The justification for replacing the RMS is that the rubber is now 15 years old and has probably lost much of its elasticity making it a prime suspect for a possible leak in the future.
But as you mention, any type of invasive procedure creates the risk of introducing or creating a problem where there was none previously.
If it were me, I'd replace it while following Gelbster's advice regarding JFP's recommended best practices.
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1999 996 C2 - sold - bought back - sold for more
1997 Spec Boxster BSR #254
1979 911 SC
POC Licensed DE/TT Instructor
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