As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
RETURNED & ACFT WAS GROUNDED. FLIGHT RETURNED DUE TO AN AFT AVIONICS DOOR FAULT & NOT BEING ABLE TO PRESSURIZE THE ACFT. PERFORMED A FUNCTIONAL TEST OF THE DOOR WARNING SYS IAW AMM 51-71-00-710-001-A & NO DEFECTS WERE NOTED & THE ACFT WAS RETURNED TO SERVICE.