Generic response: For any bosh deployment you can utilize "bosh restart" to perform a graceful stop / start
( https://community.pivotal.io/s/article/understanding-bosh-start-stop-restart-and-recreate )
More in detail: PCC is one of the more complicated product offerings and any shutdown / startup procedures , and their effects on your applications, should be tested in a sandbox environment. It should be able to "stop" and "start" gracefully, but every platform is unique and should be tested.
~Madeline