As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT WOULD NOT PRESSURIZE ON CLIMBOUT.-C/A-DEFERRED PRESSURIZATION SYSTEM. M PROCEDURES C/W. MEL 21-19 AUTH 090955DM-C. PERFORMED OPC IAW EMB 140 AMM 21-31-00. OPC OF MANUAL AND AUTO PRESSURIZATION GOOD. NO DEFECTS NOTED. MEL RESTORED. M- PROCEDURES REVERSED.