What was found
AIRCRAFT NOT GROUNDED - AT CRUISE FL 390 WITH AUTOPILOT 1 ON, AUTO THRUST DISCONNECTED, ENGAGED AUTOPILOT 2 AND REENGAGED AUTO THRUST, SYSTEM STAYED ON. INSPECTED AND CLEANED J3 HARNESS (ENGINE #2), OPERATIONAL CHECK NORMAL, PER AMM 71-51-43, ESPM 20-55-20, TSM TASK 71-50-00-810-810A. CONTINUITY CHECK IN CIRCUIT GOOD. REMOVED AND REPLACED RELAY 5CA1 PER TSM 73-29-00, OPERATIONAL CHECK GOOD.