As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLT # 2184, RDU-BOS. AT FL 290 IN CRUISE A/C UNEXPECTEDLY YAWED TO THE LEFT REQUIRED HALF-SCALE RUDDER TRIM TO CORRECT. DURING DECENT A/C YAWED RIGHT REQUIRING REMOVAL OF TRIM . RUDDER OSCILLATED INFREQUENTLY BUT NOTICEABLY THROUGH DECENT. APPROACH WAS NORMAL; TROUBLESHOT SYSTEM WITH TECHNICAL SUPPORT, UPON REVIEWING DVDR FOR AC, FOUND LOWER PCU TO APPEAR INTERMITTENTLY OFFLINE. R&R LOWER RUDDER PCU IAW AMM 27-22-01. PERFORMED QUICK RIGGIN PROCEDURE IAW AMM 27-22-01. OPS/LEAK CHECK GOOD.