What was found
DURING CLIMB APPROX. FL320 CREW EXPERIENCED A TRIM RUNAWAY FROM THE RIGHT SIDE TRIM TAB. UPON DISCONNECTION OF AUTOPILOT, TRIM RUNAWAY STOPPED, AND MANUALLY TRIMMED AS NEEDED. CHECKLIST FOLLOWED, EMERGENCY DECLARED, AND UNEVENTFUL LANDING PERFORMED. MAINTENANCE EVALUATION COULD NOT DUPLICATE PROBLEM, INSPECTION OF ROLL TRIM SYSTEM ACTUATORS, TRAVEL, ELECTRICAL WIRING / CONNECTIONS, AND MULTIPLE OPERATION CHECKS OF ROLL TRIM SYSTEM WERE NORMAL. PRECAUTIONARY SWAP OF #1 AND #2 FLIGHT CONTROL COMPUTER CARDS PER OEM RECOMMENDATION, ALL TESTS AND INDICATIONS NORMAL. SUBSEQUENT FLIGHT PERFORMED WITH NO ISSUES.