As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
UPON LANDING, PRESSURIZATION SYSTEM DID NOT OPEN THE OUTFLOW VALVE TO DEPRESSURIZE THE AIRCRAFT. GROUNDED - YES. BOTH CONTROLLERS, PERFORMED DCPC BITE REF FIM 21-31 TASK 801. NO EXISTING FAULTS NOTED. NO FAULTS NOTED ON INBD FL OR PREVIOUS ONE. GROUND TEST BITE PASSES BOTH CONTROLLERS.