As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLT 4770 - DURING CRUISE FLIGHT FROM ILM-ATL, WHILE DESCENDING THROUGH 20,000 FEET AND AFTER RETARDING THE POWER TO 50 PERCENT N1, AN ODOR OF SMOKE OCCURRED IN THE COCKPIT. THE AIRCRAFT LANDED SAFELY IN ATL. MAINTENANCE REMOVED AND REPLACED THE LOAD CONTROL VALVE IN THE AUXILIARY POWER UNIT. OPERATIONAL CHECKS GOOD. AIRCRAFT OK FOR SERVICE. (M)