As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLIGHT 7638 MSY TO ORD WHILE ON CLIMBOUT THE CREW ENCOUNTERED SOME LIGHT TURBULENCE AND RECEIVED -CRG AFT SMOKE- WARNING, -AVNX MAU 3B FAIL-, -SPOILER FAULT- CAUTIONS, AND -CMF1 FAIL- ADVISORY EICAS MESSAGES SIMULTANEOUSLY. THE CREW RAN THE QRH FOR AFT CARGO SMOKE. THE AFT CARGO SMOKE LIGHT EXTINGUISHED. NO UNUSUAL SMELLS AND NO SMOKE NOTED IN THE CABIN. THE CREW RETURNED TO THE MSY, DECLARED AN EMERGENCY AND LANDED WITHOUT INCIDENT. MAINTENANCE REPLACED THE MAU3 NR 1 POWER SUPPLY.