As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
VNAV BUTTON LIGHT ON MCP INOPERATIVE. ACFT GROUNDED. REPLACED THE A/P MCP IAW MM 22-11-34-400-801. OPS CK GOOD IAW MM 22-11-34-740. PERFORMED THE DFGS LRU INTERFACE TEST FOR MCP IAW MM22-11-34/501, TEST GROUP 32, PASSED. PERFORMED LAND VERIFY TEST IAW MM 22-11-00/201, TEST GROUP 49, PASSED. PERFORMED THE HGS SENSOR TEST FOR FCC IAW SMM 34-36-00, PASSED. ACFT REMAINS CAT III A AUTOLAND & HGS SCREW REFLECTS THE SAME.