As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
SHORTLY AFTER T/O FROM FWA THE LT ENGINE INTAKE FAILED. CREW RAN QRH AND SYSTEM FAILED AGAIN (APPROXIMATELY EVERY 15 SECONDS). AIR RETURN TO FWA. MAINTENANCE REPLACED LT DE-ICE MODULE P/N 44730-501, S/N ON A00122 IAW SF340 MM, ALL CHECKS GOOD.