What was found
CAPTAIN'S COURSE SELECTOR ON MCP IS BLANK. COURSE INFORMATION IS STILL SHOWING ON NAV DISPLAY. ACFT GROUNDED. COULD NOT DUPLICATE PROBLEM. EXITING CREW FROM LAST FLIGHT VERBALIZED MCP CAPT COURSE WINDOW NORMAL. OPS, NO BLANKING. NO HISTORY LAST 30 DAYS. PERFORMED DFCS LRU INTERFACE TEST FOR MCP IAW AMM 22-11-34 AND DFCS LRU REPLACEMENT TEST FOR CDS, CHECKS COURSE, WINDOW READ OUTS - NORMAL OPS THROUGHOUT ENTIRE RANGE 000-359 IAW FIM 22-11, TASK 802, ALL OPS NORMAL. NO DEFECTS. ETOPS SIGNIF - GROUND VERIFICATION SUCCESSFUL. ACFT LWMP STATUS & SCREW REMAIN CAT IIIA A/L & HGS.