As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
RIGHT HAND INTAKE LIGHT RECYCLES ON EVERY 20 SECONDS. RAN QRH RESET AND LIGHT CONTINUED TO RECYCLE EVERY 20 SECONDS. AIR RETURN TO DTW. REMOVED AND REPLACED INLET DUCT P/N ON NH24668-169-01. P/N OFF NH24668-165, S/N ON L291006, S/N OFF L211713 IAW SF340 AMM 71-60-05. OPS CHECK GOOD.