What was found
PILOT REPORTS, VIBRATION FELT IN RUDDER PEDALS AT 240 KTS. A/C RETURNED TO MKE. FOUND LT APU ACCESS DOOR HAD COME OPEN TO CAUSE VIBRATION. REPLACED DOOR, NO OTHER DAMAGE NOTED.
As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
PILOT REPORTS, VIBRATION FELT IN RUDDER PEDALS AT 240 KTS. A/C RETURNED TO MKE. FOUND LT APU ACCESS DOOR HAD COME OPEN TO CAUSE VIBRATION. REPLACED DOOR, NO OTHER DAMAGE NOTED.