What was found
REF. LP 60336229. CAPT REPORTS STILL HAVING ISSUES W/ MCP BLANKING, GOING INTO LOCK OUT MODE. GROUNDED - YES. PERFORMED DFCS BITE IAW B737-800 FIM 22-11 TASK 801. NO RELEVANT FAULTS IN FAULT HISTORY FOR MCP. REMOVED AND REPLACED MCP AS PRECAUTIONARY, DUE TO HISTORY, IAW B737-800 AMM 22-11-34-000/400-801. PERFORMED INSTALL TEST IAW AMM 22-11-34-740-801. PASSES TEST. PERFORMED DFCS LAND VERIFY IAW AMM 22-11-00-700-801. PASSES TEST. PERFORMED HGS SYSTEM TEST IAW SMM 34-36-00 SEC 500. PASSES TEST. NO FAULT IN RECORDED OR EXISTING. ALL TESTS PASS. A/C OK FOR SERVICE. CAT III DUAL AP AND HGS AUTHORIZED. APPROACH SURVEY COMPLETE.