What was found
AIRCRAFT WAS GROUNDED: AN EMERGENCY WAS DECLARED AND THE AIRCRAFT RETURNED TO SDF DUE TO THE FLIGHT CREW REPORTING A LOUD SQUEALING NOISE FROM 3L DOOR ON CLIMBOUT. THE DOOR PAGE SHOWED ALL DOORS SECURED. THE AIRCRAFT LANDED SAFELY AT SDF WITHOUT FURTHER INCIDENT. MAINTENANCE FOUND FOD / STRAP HANGING OUT THE R4 DOOR, SECURED STRAP AND INSPECTED THE SEAL FOR DAMAGE WITH NONE FOUND. MAINTENANCE ALSO INSPECTED THE L3 DOOR SEAL AND FRAME FOR DAMAGE AND FOUND NO ISSUES.