What was found
AFTER TAKE OFF AT 1000 FT AGL, RECEIVED A LEVEL 3 ENG 2 ALERT, ICE DUCT. COMPLIED WITH QRH RETURNED TO DEPARTURE. ACCOMPLISHED FIM 30-22-05-00. PERFORMED A NR 2 ENGINE ANTI-ICE INSPECTION CHECK IAW AMM 30-22-00-6-2. INSPECTED ENGINE ANTI-ICE DUCTS, DUCT FLANGES, DUCT COUPLINGS, SUPPORT LINKS, NO DISCREPANCIES FOUND. REMOVED AND REPLACED THE NR 2 ENG NOSE COWL ANTI ICE VALVE IAW AMM 30-22-01. R & R THE CONTINIOUS FIRE DETECTOR UNIT (CFD) IAW AMM 30-22-10-4 AND RELAY R2-5527 IAW SMP, CHECKED OK. REMOVED & REPLACED THE NR 2 ENGINE MANIFOLD FAILURE SENSING ELEMENT D1-89, D1-90 AND D1-91 IAW AMM 30-22-11-4. RAN NR 2 ENGINE IAW JRH CHAPTER 5, CHECKED THE ANTI-ICE SYSTEM AND NO DISCREPANCIES NOTED. ACFT OK FOR SERVICE.