As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CLICKING NOSE HEARD FROM AROUND MCP SEEMED TO ONLY MAKE NOSE WHILE IN CLOUDS WE WERE AT FL360, -45 DEGREES CELSIUS. ACFT GROUNDED. REPLACED MCP PANEL IAW AMM 22-11-34-401, RAN LAND VERIFY TEST IAW AMM 21-11-00-201 AND HGS IAW AMM 34-36-00. ACFT REMAINS HGS AND AUTOLAND CAT III.