What was found
MCO - FLT 1826 - ON CLIMB-OUT, AIRCRAFT BEGAN TO YAW AT AROUND 3,000 FEET. CAPTAIN TURNED YAW DAMPER OFF AND RUDDER UNRESTRICTED LIGHT CAME ON. CAPTAIN SWITCHED TO RUDDER POWER CONTROL TO MANUAL AND YAW STOPPED. TURNED AUTOPILOT ON AND YAW BEGAN AGAIN. TURNED AUTOPILOT OFF AND AIRCRAFT CONTINUED TO YAW, NOW AT 25,000 FEET. CAPTAIN RETURNED TO FIELD AT MCO AND LANDED WITH NO FURTHER INCIDENT. MAINT FOUND CANNON PLUG ON RUDDER YAW DAMPER CORRODED. REPLACED CANNON PLUG ON YAW DAMPER AND REPLACED YAW DAMPER ACTUATOR AS PRECAUTIONARY. REPLACED BOTH PROX SENSORS AND PERFORMED SENSOR ADJUSTEMENT. OPS CHECKS NORMAL. PERFORMED OVERWIEGHT LANDING INSP. REF: OPER CNTRL NR USAAD98064 AND NR 98ZZZX2258.