It’s an interesting one and something upon which opinions can reasonably differ. With deference to higher TWS priorities, the ability for Members to transfer wines to one another would be great, without involving third parties. Whatever benefits accrue to the wine in Q should continue, as bought and stored with TWS. Anything in reserves is insured, as part of the storage fee.
Tastes change and wines evolve (and the burden to the TWS and members could become unacceptably high) so I don’t think it would be unreasonable to curtail the TWS Promise to obviously defective wines that are in Reserves. If sold defective then the usual replacement rules should apply. That the relevant member has not had the chance to discover such for the time it has been in storage should not change the position in my view. Not sure corking happens over time, just that the wine in question will deteriorate further over time.
One for TWS to maybe look at in due course but not a priority in the grand scheme of things I think.