What was found
ABORTED TAKEOFF, ANTI-ICE DUCT WARNING MESSAGE AND DUCT FAIL OVER HEAD LIGHT ILLUMINATED ON T/O ROLL. SYNOPOTIC PAGE SHOWED RED LINE ON RT FUSELAGE MESSAGE REMAINED ON AFTER ENGINES WERE SHUT DOWN. REMOVED AND REPLACED FUSELAGE SENSING ELEMENT A18WK IAW AMM 36-21-04. ACFT REQUIRES OPS CHECK SEE NRCC#30413. PERFORMED OP CHECK OF BLEED AIR LEAK CONTROL UNIT IAW AMM 36-21-10. OP CHECK GOOD. OK FOR SERVICE. FOUND LOOP A18WK BAD. REMOVED AND REPLACED LOOP IAW AMM 36-21-04. OK FOR SERVICE. REMOVED AND REPLACED COALESCER SOCKS IAW AMM 21-51-13. VERIFIED PARTS.