Thanks for the tip re silicone and movement. At the risk of sounding improbably prepared, I do have one of those and used it when I opened the caseback. The gasket although quite hefty as these things go, was completely dry.
I am not yet sure however how the crown and tube seals appear on this case nor how to access them to lubricate. They are the original stiff seals this case comes with.
It had apparently passed muster at the service centre's pressure test.
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