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FWIW, I had my IMSB replaced at 42k miles on my '03S in 2012. The RMS was bone dry, and consulting with my Indie P car specialist doing the work we decided to leave it alone. At 48k miles the RMS started leaking, so the transmission came back out and I got a new RMS. I am now at 65k miles and it is still dry. I don't know if removing and replacing the flywheel puts any new forces on the end of the crank or the RMS which could cause it to start leaking, but mine did start to leak 6,000 miles and a year after the IMSB was replaced. In the future, like when I need a new clutch, and if I replace the IMSB again, I may just do the RMS again too.
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