As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
UNCOMMANDED YAW AT ALTITUDE FULL EXTREME DEFLEXCTION OF RUD L/R TRIM SELF INDUCED.INSPECTED AND FOUND YAW DAMP 1 INOPERATIVE. REFER TO LOGPAGE 528630 ITEM 2 FOR NEW DISC. PERFORMED OPS CHECK OF RUD TRIM IAW CRJ-AMM-27-22-00. TRIM OPS CHECKS GOOD.INSPECTED AND FOUND RUD TRIM KNOB HAS NO DETENT. REPLACED RUD TRIM PANEL IAW CRJ-AMM-27-12-10. SYSTEM CHECKS GOOD.