Interesting, I work in the wind turbine industry (at the margin, and since one month, I guess I'm an expert), and it's the same, there are interesting sensors and data everywhere, but everything is locked down, and as long as the warranty runs, the owner of the turbine is at the mercy of a very reluctant maker for every maintenance task. The owner can't use any of those very useful sensors to assess the state of the turbine, he has to call external consultants who will re-instrument the turbine with external sensors at great cost, when they could have just downloaded the existing data from their office to give a look at it.
Specific to Clipper, the owner of the technology keeps enough money around to keep rebuilding the crazy gearboxes for current owners, while other spares can often be obtained directly from the actual component manufacturers. Third party service organizations like EDF Services or UpWind keep them running for you, or you can hire your own techs.
Depending on the contract the relevant design information may also put in escrow in the event the manufacturer goes under and spares are no longer available.
For comparison, Zond and US Windpower died more than a decade ago but the owners are still keeping the machines going. It can be a challenge but it's not the end of the world.
