As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING FLIGHT NR 2797, LEFT INTAKE ANNUNCIATOR ILLUMINATED INTERMITTENTLY W/ ANTI-ICE SYSTEM. AIR RETURN TO MEM. MAINTENANCE FOUND NR 3 AND NR 4 THERMISTOR BAD, SWAPPED TO NR 5. PERFORMED OPS CHECK GOOD IAW ACT SPRAYMAT REPAIR MANUAL 30-21-03. A/C OK FOR SERVICE.