As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
A/C DID NOT PRESSURIZATION / PRESSURIZE. RETURNED TO DFW. NO EICAS ALERTS, LANDED AT APPROX 39,000 LBS. DEFERRED AUTOMATIC PRESSURIZATION MODE .C/W MAINT ACTION. PERFORMED MANUAL PRESSURIZATION & FOUND WORKING PROPERLY IAW MM 21-31-00. C/W "M" PROCEDURES AND REACTIVATED ELECTROPNUMATIC OUTFLOW VALVE IAW EMB AMM 21-31-03-440-801-A. REMOVED AND REPLACED DIGITAL CONTROLER IAW EMB AMM 21-31-01-000-801-A AND 21-31-01-400-801-A OPC GOOD MEL RESTORED