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Even a good seal should be leaking a bit of water during opeation. But 200l entering the lubrication circuit is a sign of bad work and worse supervision.
This here explains the technology a bit:
http://www.brighthubengineering.com/naval-architecture/62728-what-is-a-ships-stern-tube/
Should the subcontractor have to pay the dry dock, even a bigger subcontractor could be bankrupt. I am pretty sure, this won't happen, especially if the subcontractor waves with a memo, that the Royal Navy inspected the shaft seal and found it good.