What was found
(CAN) THE FLIGHT CREW RECEIVED AN ANTI-ICE DUCT WARNING MESSAGE DURING FLIGHT. THE APPLICABLE SYNOPTIC PAGE SHOWED THE RT WING LEADING EDGE BEING AT FAULT. WING ANTI-ICE SWITCH WAS SELECTED FROM NORMAL TO STAND-BY WITHOUT SUCCESS. DURING TROUBLESHOOTING, MAINTENANCE DISCOVERED THE RT WING OB ANTI-ICE DUCT (PICCOLO TUBE) REF IPC 30-11-00-10-240C END CAP MISSING. THE WELDED PICCOLO TUBE END CAP HAS RUPTURED FROM THE ASSY. THE ANTI-ICE DUCT ASSY WAS REPLACED IAW AMM 30-11-41 AND THE AIRCRAFT RELEASED INTO SERVICE. (TC NR 20070713001)