What was found
"A" AUTOPILOT WILL NOT STAY ENGAGED. GROUNDED - YES. FOUND BAD "A" A/P ELEVATOR ACTUATOR AND PLUG CORRODED. REMOVED AND REPLACED AUTOPILOT ELEVATOR ACTUATOR "A" REF B737-800 AMM 22-11-26, CONNECTOR D1681 REF B737 SWPM 20-61-00 AND AUTOPILOT ELEVATOR "A" PRESSURE SWITCH REF AMM 22-11-40. LEAK CHECK GOOD. REF AMM 22-11-26-710-801 AUTOPILOT ELEVATOR ACTUATOR TEST GOOD. LAND VERIFY GOOD REF AMM 22-11-00. OPERATIONAL CHECK OF AUTOPILOT ACTUATOR TEST "A" CHECKED GOOD REF AMM TASK 22-11-26-710-801. LLM MAINTENANCE TEST PASSED REF AMM TASK 22-11-26-839-001. NO FAULTS FOUND. ETOPS GROUND VERIFICATION SUCCESSFUL.