What was found
BOS - FLT 2039 - DURING CLIMB-OUT, EN ROUTE BOS/ORD, RIGHT ENGINE FIRE LOOP B ILLUMINATED IMMEDIATELY FOLLOWED BY LOOP-A AND ENGINE FIRE WARNING. ACCOMPLISHED ENGINE FIRE CHECK LIST. RETURNED AND LANDED BOS WITHOUT INCIDENT. INSPECTED ENGINE WITH NO FIRE NOTED. REPLACED BLOWN ANTI-ICE TUBE DUCT ASSEMBLY AT 12 O'CLOCK POSITION. INSPECTED ASSOCIATED WIRING AND DUCTING. SYSTEM GROUND CHECKED, NORMAL OPERATION. (X0