What was found
PHX FLT 125 EN ROUTE HNL TO PHX. WHEN AUTOPILOT WAS DISCONNECTED AT 6000FT ON APPROACH THE ROLL YOKE CONTROL WAS VERY HEAVY (ABOUT 3X NORMAL FORCE). IT WAS THE SAME IN BOTH CAPT AND F/O YOKE. (PITCH CONTROL WAS NORMAL) THIS HEAVINESS REMAINED AFTER LANDING DURING TAXI. WHEN THE ENGINES WERE SHUT DOWN THE CONTROL EQUALLY (OVER ABOUT 10 SEC SPAN) RETURNED TO NORMAL. MAINTENANCE REMOVED AND REPLACED THE CENTER AUTOPILOT LATERAL CONTROL SERVO. SYSTEM FEEL, CENTERING & TRIM TEST WAS PERFORMED. AUTOPILOT FUNCTION AND FEEL FORCE IS NORMAL. VENDOR SHOP FINDINGS: VISUAL INSPECTION OK. SOLENOID NR 2 FAILS CONTINUITY, UNIT FAILS DE-ENERGIZED FRICTION, OUTPUT FORCE, ROD END BEARING STICKS.