What was found
SMF - EN ROUTE, RDD TO SFO, CREW REPORTED UNCOMMANDED PITCH UP TENDENCY WITH AUTOPILOT ENGAGED DURING CLIMB-OUT. CREW DISENGAGED AUTOPILOT AT 12,000 FEET ALTITUDE. CREW REPORTED STIFF ELEVATOR MOVEMENT CONTINUED FOLLOWING DISENGAGEMENT OF AUTOPILOT. CREW DECLARED EMERGENCY AND DIVERTED TO STATION WITHOUT INCIDENT. MAINTENANCE INSPECTED ELEVATOR AND ELEVATOR TRIM SYSTEM. NO DEFECTS NOTED DURING INSPECTION, UNABLE TO DUPLICATE REPORTED DISCREPANCY ON SUBSEQUENT TEST FLIGHT. LUBRICATION OF ELEVATOR TRIM ACTUATION SYSTEM ACCOMPLISHED AS A PRECAUTION. AIRCRAFT RETURNED TO SERVICE. (X)