What was found
AIRCRAFT WAS NOT GROUNDED: MAIN CABIN DOOR WAS JAMMED. WERE ABLE TO OPEN AFTER SEVERAL ATTEMPTS. AFTER PAX DEPLANED. THE AGENT AND I TRIED TO OPEN AND CLOSE AGAIN. THE DOOR GOT STUCK 1/4 OF THE WAY OPEN. TOOK SEVERAL MORE ATTEMPTS TO OPEN UP. FOUND FORWARD ENTRY DOOR UPPER GUIDE ARM TRIM FLAP OUT OF POSITION AND INHIBITING FREE MOVEMENT OF THE DOOR. FREED THE HINGE DOOR AND OPERATED FORWARD ENTRY DOOR, PER AMM 52-11-00