What was found
AFT CARGO DOOR OPEN INDICATION AFTER TAKEOFF AT 500 FEET. RETURNED TO JFK AT 5000FT & 210 KIAS. STARTED FEELING VIBRATIONS WHEN ACCELERATING TO 190 KIAS. VB WENT AWAY AT 180 KIAS. VISUAL INDICATION THAT DOOR WAS OPEN. LANDED UNEVENTFULLY. INSPECTED AFT CARGO DOOR & SURROUNDING STRUCTURE AS PER EA E-07-088. REPAIRED DAMAGED AFT CARGO DOOR AFT FRAME ROLLER FITTING & ACCESS COVER AS PER EA E-07-089 & EA E-07-090B PART 1 DOOR FRAME INSPECTION. OPERATION & INDICATOR CHECKED NORMAL. OK FOR SERVICE.