As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ENGAGE LIGHT FOR THE VNAV SWITCH ON THE MCP IS INTERMITTENT. ACFT GROUNDED. REPLACED MCP, REF AMM 22-11-34/401. INSTALLATION TEST, LRU REPLACEMENT TEST FOR MCP BITE GROUP NR 32, LAND VERIFY BITE GROUP NR 49, AND HGS SENSOR TEST FOR FCC/AT ALL PASS. ACFT REMAINS CAT III A HGS AND AUTOLAND QUALIFIED.