As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CONTROL WHEEL FEELS LIKE THERE IS A DETENT AS YOU TURN EACH DIRECTION. PRIOR TO THAT POINT FROM CENTER (NEUTRAL) POSITION, TURN RATE IS SLOW. AFTER THE DETENT THE TURN RATE INCREASES. A/C DIVERTED TO SERVICE CENTER. REMOVED ROLL SPOILER MIXER BACK ASSEMBLY DUE TO WEAR. INSTALLED NEW MIXER BOX ASSEMBLY IAW THE MM CHAPTERS 27012092 AND 27-10-00. TRAVEL CHECK AND OPERATIONAL CHECKS NORMAL.