As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AT CRUISE, DURING FLIGHT, AIRCREW NOTICED SMOKE IN COCKPIT AND CABIN. ACFT DIVERTED AND AN EMERGENCY WAS DECLARED. MAINTENANCE FOUND RT ACM MAKING LOUD SQUEALING NOISE AND SMOKING. MAINTENANCE R & R THE RT ACM IAW AMM 21-51-03. THE UNIT OPS CHECKED GOOD. THE ACFT WAS APPROVED FOR RETURN TO SERVICE.