As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ON DEP AFTER GEAR RETRACTION MASTER WARINING FOR DOOR PAX AFT OPEN RAN APPR CHECK LIST QRH DECLARED EMERGENCY RETURNED TO AIRPORT KELP LANDED UNDER MAX LANDING WIGHT-C/A-PERFORMED OPS CHECK AFT PAX DOOR IAW EMB 175 AMM 52-12-00 ALL CHECKS GOOD DEFERRED WARING SYSTEM