As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
THE LIGHT ON THE VNAV BUTTON AND THE A/T ARM LIGHT ON THE MCP WERE INOPERATIVE. ACFT GROUNDED. REMOVED AND REPLACED DFCS MODE CONTROL PANEL IAW AMM 22-11-34. MCP INSTALLATION TESTED GOOD IAW AMM 22-11-34. LRU REPLACEMENT TESTED FOR MCP, BITE TEST GROUP 32, TESTED NORMAL. DFCS LAND VERIFY, BITE TEST GROUP 49 TESTED NORMAL IAW AMM 22-11-00/201.