What was found
FLT 102, JFK-BUF. RETURNED TO FIELD. AIR RETURN FOR "DOOR PAX FWD OPEN" WARNING MESSAGE. RAN QRH - "MINIMUM OF 2 DOOR INDICATORS GREEN" FORWARD FLIGHT ATND RELAYED SHE ONLY SAW 1 GREEN INDICATION. ALSO INDICATED SHE HEARD A KNOCK OR THUMP SHORTLY BEFORE OR AFTER 10,000. MSG APPEARED AT APPROX 17000; FOUND LT VISUAL LOCK INDICATOR OF FWD PAX DOOR BENT AND IMPEDING PROX SENSOR TARGET FROM COMING INTO RANGE. R & R LT VISUAL LOCK IND. REF MM 52-11-22. REPLACED LT VISUAL LOCK IND SPRING AS WELL REF MM 52-11-22. PERFORMED CHECK OF DOOR W/ PRESSURIZATION REF MM 21-31-00. LEAK CK +OPS CKS GOOD.