As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DFW - CREW REPORTED AIRFRAME VIBRATIONS FELT THROUGH THE PEDALS AND THE FLOOR. EMERGENCY DECLARED, RETURNED TO DFW WITHOUT INCIDENT. AIRCRAFT REMOVED FROM SERVICE. FOUND AIR START ACCESS PANEL FORWARD OUTBOARD HINGE BROKEN AND CORNER OF PANEL LOOSE CAUSING DAMAGE TO THREE FORWARD LATCHES. REPLACED BOTH HINGES AND THREE FORWARD LATCHES. SYSTEM GROUND CHECK NORMAL OPERATION.