As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
NR 3 INTAKE LOW PRESS LIGHT ILLUMINATED INFLIGHT. AIR RETURN TO DTW. MAINTENANCE DEFERRED NR 3 ENG INTAKE LOW PRESS INDICATION PER MEL 30-20-2-2-C ENTERED INTO DMR MXC NOTIFIED. REPLACED NR 3 ENG ANTI-ICE LOW PSI SWITCH, P/N HTE690041, S/N OFF FR074BA, S/N ON FR102BA IAW AMM 30-21-14. OPS CHECK GOOD. REMOVED FROM DMR. MXC NOTIFIED NR 4632.