The old 12V battery was on its way out and was even swelling, yet no dash warning, so I’m really happy I had it replaced. The service tech had two in his car spare.I logged a service call over the weekend to replace the wiper driver mechanism on my 2014 Model S, as the drivers side wiper arm has started to rub against the bonnet above it. Apparently this is a known issue. A mobile service call has been arranged for tomorrow and I have a price for the spare part and labour. As the car is 8 years old soon and the last 12V battery was replaced under warranty I’m getting that replaced at the same time.
No indication so far that any of these parts are a problem to source.
The wiper issues was not as good. They sent him out with a new wiper arm but fitting that made no difference, they have rescheduled for next Tuesday so hopefully they will have the wiper drive unit by then.