After calling the control room I drove past CS @ 23:58 and arrived at Y-Mid station @ 00:01.
Started filling CP3 @ 00:03, opened the exhaust check valve bypass valve, then opened LLCV bypass valve 1/2 turn, closed the flow 25 seconds later.  5 minutes later I closed the exhaust check valve bypass valve.

Started driving back from Y-Mid @ 00:12, arrived at the CS @ 00:16.