Very common questions get at basic things- what are the pain points you've encountered running the system? What monitoring systems are you using? What are known failure modes where monitoring is silent? Have any agreements on availability or latency/performance been reached with users? What is the process to qualify, push, and rollback changes? What's the impact to the user / to the company if everything goes and stays down? What are your runtime dependencies and how do you behave if they fail? Provide a review of recent monitoring alerts?
Most of the value in most PRR checklists really just get at the above- sometimes the answer really is "we don't know" or it is incomplete (especially re: runtime dependencies) so follow up questions can make discovery easier.
 often the SREs can figure this out and will look them up without even asking a question. Lots of formalized processes ask people to list what's needed to do this anyway (e.g. list alert queues, mailing lists that receive alerts, etc.).