As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DUB - ENTRY DOOR RETURN SPRINGS WEAK (DOOR OPERATION NORMAL). THIS DISCREPANCY HAS SUBSEQUENTLY BEEN FOUND TO BE DUE TO A PROBLEM WITH THE FORWARD LAVATORY DOOR, NOT AN AIRCRAFT ENTRY DOOR. THE MAINTENANCE ACTION WAS: "INSTALLED SPRING IN DOOR FORWARD LAV. OP CHECK GOOD".