As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING DESCENT INTO MEM, EXPERIENCED BURNING ODOR AND OBSERVED WHITE SMOKE IN COCKPIT. DECLARED AN EMERGENCY AND PROCEEDED TO MEM AND LANDED UNEVENTFULLY. INSPECTED ALL AVIONICS BAYS AND BEHIND CIRCUIT BREAKER PANELS, OVENS, AND COFFEEMAKERS WITH NO PROBLEMS FOUND AND NO ODOR PRESENT. RAN BOTH PACKS WITH NO SMOKE NOTED. PERFORMED TEST FLIGHT WITH NO SMOKE OR ODOR PRESENT. AIRCRAFT RETURNED TO SERVICE.