As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
WITH THE AUTOMATIC PRESSURIZATION SYSTEM ON MEL THE AIRCRAFT DEPARTED SAV USING THE MANUAL PRESSURIZATION MODE. DURING CLIMB THE AIRCRAFT WOULD NOT PRESSURIZE USING THE PRESCRIBED PROCEDURES IN THE MEL AND QRH. THE CABIN RATE OF CLIMB AND DESCENT MATCHED THE VSI RATE. THE AIRCRAFT LEVELED OFF AT 8,000FT AND DIVERTED TO ATL WHERE IT LANDED WITHOUT INCIDENT. MAINTENANCE FOUND THE ELECTRO-PNEUMATIC OUTFLOW VALVE NOT SECURELY SEATED. THE DE-ACTIVATION PROCEDURE WAS PERFORMED ON THE ELECTRO-PNEUMATIC OUTFLOW VALVE AND THE AIRCRAFT WAS RELEASED FOR SERVICE WITH THE AUTOMATIC PRESSURIZATION SYSTEM ON MEL.