As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
RIGHT INTAKE LIGHT CYCLES ON/OFF IN CRUISE FLIGHT. APPROXIMATELY EVERY 30 SECONDS. RAN QRH, NO CHANGE. MX DISPATCH NOTIFIED. AIR RETURN TO DTW. OMHED OUT THE SYSTEM EVERYTHING NORMAL. REPLACED DE-ICE CONTROL MODULE. ALL SYSTEMS TESTED NORMAL AT THIS TIME IAW CHAP 30. P/N ON/OFF 44730-501, S/N OFF A00562, S/N ON A00201.