As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
HEADING KNOB WORKING IN FAST MODE ONLY. ENTERED ON DMI NR 21598 AS PER MEL 22-1-(L) CAT "C". REMOVED AND REPLACED HDG GUIDANCE CONTROL PANEL IN ACCORDANCE WITH M/M 22-00-00. CHECK GOOD IN ACCORDANCE WITH M/M 22-00-00. CLEARED DMI NR 21598; PLACARD REMOVED.