Narrative:

Before takeoff, I confirmed door 1L and door 1R were armed. During climb, #1 flight attendant stated over PA that every one, including crew, were to stay in their seats. I was told by flight attendant #5 that door 1R was opening. We turned around to puj and landed. When we landed, I went to 1R and saw the door was armed and that the door handle had risen 6 inches. They tried to close the door and it would not go. Flight attendant #1 then disarmed the door and then closed it. Then the captain opened the door without incident. The door was now operating fine. We were told that a test would be done to see if we could re-create the incident. The cabin was pressurized, with all of the doors in armed mode. Everything was fine. We took off with no further occurrences.

Google
 

Original NASA ASRS Text

Title: A B-757 FLT ATTENDANT RPTED THAT, AFTER TKOF, THE 1R DOOR WOULD NOT SEAL PROPERLY, WHICH CAUSED A RETURN LAND.

Narrative: BEFORE TKOF, I CONFIRMED DOOR 1L AND DOOR 1R WERE ARMED. DURING CLB, #1 FLT ATTENDANT STATED OVER PA THAT EVERY ONE, INCLUDING CREW, WERE TO STAY IN THEIR SEATS. I WAS TOLD BY FLT ATTENDANT #5 THAT DOOR 1R WAS OPENING. WE TURNED AROUND TO PUJ AND LANDED. WHEN WE LANDED, I WENT TO 1R AND SAW THE DOOR WAS ARMED AND THAT THE DOOR HANDLE HAD RISEN 6 INCHES. THEY TRIED TO CLOSE THE DOOR AND IT WOULD NOT GO. FLT ATTENDANT #1 THEN DISARMED THE DOOR AND THEN CLOSED IT. THEN THE CAPT OPENED THE DOOR WITHOUT INCIDENT. THE DOOR WAS NOW OPERATING FINE. WE WERE TOLD THAT A TEST WOULD BE DONE TO SEE IF WE COULD RE-CREATE THE INCIDENT. THE CABIN WAS PRESSURIZED, WITH ALL OF THE DOORS IN ARMED MODE. EVERYTHING WAS FINE. WE TOOK OFF WITH NO FURTHER OCCURRENCES.

Data retrieved from NASA's ASRS site as of July 2007 and automatically converted to unabbreviated mixed upper/lowercase text. This report is for informational purposes with no guarantee of accuracy. See NASA's ASRS site for official report.