What was found
D LT COWL AI DUCT WARNING MSG IN FLIGHT RAN THE QRH LEAD TO INFLIGHT ENGINE SHUTDOWN B1 349549 LOOP BC MEL 36-21-6CCAT C DUE 110426. FLIGHT 4684, INTEROGATED MDC , FOUND B1-349549 IN AIRCRAFT HISTORY TROUBLESHOT IAW 36-21-01 INSPECTED LOOP ELEMENT, NO DEFECTS NOTED INSPECTED DUCTING, FOUND NO DEFECTS REMOVED AND REPLACED LH COWL ANTI-ICE VALVE WITH A SERVICEABLE UNIT AND NEW E-SEALS IAW CRJ 900 AMM 30-22-01 UPON REMOVAL OF VALVE, FOUND ONE OF THE E-SEALS TO BE MISSING PERFORMED OPERATIONAL TEST OF THE LT CAIV IAW AMM 30-22-01 OPS CHECK GOOD, NO LEAKS NOTED.