As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ENG NR 3 INTAKE LO PSI LIGHT ILLUMINATED IN FLIGHT GRADUALY WAS ABLE TO GET IT EXTINGUISHED 80-89 PERCENT. AIR RETURN TO MSP. MAINTENANCE REPLACED NR 3 ENG INTAKE ANTI-ICE VALVE PN OFF 2351A000 SN OFF 899351-2 PN ON 2351A000-003 SN ON 899352-8 REF AMM 30-21-17. OPS AND LEAK CHECKS GOOD.