As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AFTER GATE ARRIVAL, AND SHUTDOWN RECEIVED RESIDUAL PRESSURE IN CABIN WARNING IN COCKPIT AND L1 DOOR. PACKS WERE OFF, REMAINED UNTIL COCKPIT WINDOW OPENED. GROUNDED - YES. PERFORMED BITE TEST OF CABIN PRESSURE CONTROLLER PER AMM 21-31-00 BITE TEST GOOD AT THIS TIME.