A B757 PAX REPORTS AREA OF THE LEFT AFT OVERWING EXIT WARM WITH A BURNING SMELL. THE POWER PORTS WERE TURNED OFF AND ACFT RETURN TO LAND AS HEAT CONTINUED.

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PAX RANG CALL BUTTON SHORTLY AFTER WE HAD PASSED THROUGH 10000 FT; SEATBELT SIGN STILL ON. SHE WAS SITTING NEXT TO THE AFT OVERWING EXIT; L SIDE OF ACFT. SHE SAID SHE INTERMITTENTLY SMELLED A BURNING RUBBER ODOR AND THE OUTSIDE EDGE OF THE EXIT FELT WARM TO THE TOUCH. I DID NOT SMELL THE ODOR; BUT THE AREA WAS WARM TO THE TOUCH. I THEN FELT THE REMAINING 3 EXITS; ALL OF WHICH WERE NOT WARM. I CALLED THE CAPT AND NOTIFIED HIM OF THE SITUATION. HE INSTRUCTED ME TO TURN OFF THE PWR PORT SWITCH AND WANTED THE OTHER FLT ATTENDANTS TO ACCESS THE WINDOW EXITS. FLT ATTENDANT #1 SAID SHE DID SMELL THE BURNING ODOR AND THE AREA FELT WARM. THE OTHER FLT ATTENDANT DID NOT SMELL ANYTHING UNUSUAL. I KEPT THE CAPT INFORMED AT ALL TIMES OF ANY CHANGES. HE MADE THE DECISION TO GO BACK TO ZZZ. AT THIS TIME AFTER RETURNING TO THE AREA; THE EXIT WAS GETTING WARMER AND COVERING A LARGER AREA; BUT NO SMELL. I INFORMED THE CAPT AGAIN. SHORTLY AFTER; WE LANDED AT ZZZ WITHOUT INCIDENT. AT ALL TIMES DURING OUR FLT; OUR CREW WAS MENTALLY PREPARING FOR A POSSIBLE FIRE; THEREFORE; REVIEWING OUR EXTINGUISHER LOCATIONS AND PROCS FOR FIREFIGHTING. ALL PAX REMAINED CALM AND VERY UNDERSTANDING.