We don't get written ROs here, just verbal/email reports. Both reports for my battery have said "fuse in battery compartment blown", "swap battery for equivalent". They identiied the infividual sub-component. The explanation for swap rather than repair was to get me back on the road quicker, and I agreed to it.
I guess there is a difference between individual unserviceable components (such as windscreen wipers, or that 400volt converter at the front) and component made up of other components (such as the battery and PEM). For the latter, I would expect to be paying for the sub-component plus labour, not the entire thing. Just because we talk about the battery/PEM as one component, doesn't mean that it actually is.
Do you really think Tesla would charge $40,000 for a new battery, if a fuse inside blew? I really doubt it. But, I hear 3 days to swap battery, and even the labour cost for that is scary.
Anyway, the issue is mute, because we are at the mercy of Tesla. As Roadsters come out of warranty, we'll soon start to hear how this is handled.