As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
RETURNED TO BLOCKS DUE TO ON TAXI OUT DURING FLT CONTROL CHECK OF LT RUDDER INPUT HEARD A LOUD BANGING SOUND. FOUND RUDDER PEDAL ADJ ALL THE WAY AFT WITH LT RUDDER INPUT OR RT RUDDER INPUT ON EITHER SIDE PEDAL HITS METAL COVER. ADJUSTED FULL FORWARD AND FULL AFT, OPS CHECK GOOD PER FIM 27-21-00 PG 113. NO TROUBLE FOUND, OPERATION NORMAL.