As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
SHIP 3716 -ATB/PRESS- RETURNED TO ATL DUE TO CABIN ALTITUDE ALERT. UNABLE TO PRESSURIZE CABIN. CORRECTIVE ACTION: R2 SERVICE DOOR AJAR. DOOR INDICATION CLOSED. REPLACED DOOR SNUBBER. PERFORMED R2 DOOR RIG AND ADJUSTMENT. OPS CHECKS GOOD.