What was found
UNCOMMANDED FULL RT RUDDER DEFECTION IN FLT ON A/P, NO EICAS MSG OVER POWERED, DISCONNECTED A/P AND YD, WERE ABLE TO RETRIM (ENROUTE, ACFT DIVERTED TO GSO DUE TO MX) R & R NR 1 AND NR 2 FCC CARDS IAW AMM 22-12-14 , OPS CHECK GOOD IAW AMM 22-12-14 IOC REF 22-12-14 ITEM 5 . R & R AILERON/RUDDER TRIM PANEL IAW AMM 27-12-10, OPS CHECK GOOD IAW AMM 27-22-00.