As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
EWR---CO2306, CREW REPORTED AUTO PRESSURIZATION FAILURE IN FLIGHT. AFTER DUMPING QRH AND TAXIING TO MAINTENANCE COULD NOT GET PRESSURIZATION TO STABILIZE IN MANUAL MODE. MAINTENANCE REMOVED AND REPLACED CABIN PRESS ACQUISION MODULE (CPAM) IAW EMB145 MM 21-32-01. OPS CHECKED AND LEAK CHECKED GOOD IAW EMB145 MM 21-31-01 AND 34-13-00. AUTO AND MANUAL MODES OF PRESSURIZATION OPS. CHECKED GOOD. AIRCRAFT RETURNED TO SERVICE.