As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING FLT 3181, RT INTAKE HEAT FAULTED IN FLIGHT, RT INTAKE ANNUNCIATOR LIGHT ILLUMINATED INTERMITTENTLY WITH RT ANTI-ICE SWITCH ON. A/C RETURNED TO MEMPHIS. MAINTENANCE REPLACED LOWER DUCT IAW SF3 MM CHAP 71-60-05-4. OPS CHECK OF RT ENGINE ANTI-ICE GOOD IAW SF3 MM CHAP 30-20-00-6.