What was found
L BLEED DUCT WARNING AND CAUTION MESSAGE IN FLIGHT. PERFORMED QRH PROCEDURE SUCCESSFULLY. (FLIGHT 6447 - FILED CLOSED)THIS DISCREPANCY WAS TRANSFERRED TO CAMP ITEM 30398967 WITH THE FOLLOWING CORRECTIVE ACTION: "INTERROGATED MDC, FOUND B1-349536, ALSO FOUND LEAK EVENT HISTORY CH A 141 AT 27% AND CH B 142 AT 24%. PERFORMED LEAK CHECK OF LH PACK IN REFERENCE TO AMM 21-53-00, FOUND AIR COMING FROM LH FLOW CONTROL VALVE. SEE CP 30402541 FOR R/R OF LH FLOW CONTROL VALVE. DURING INSTALLATION OF LH FLOW CONTROL VALVE, FOUND LH INLET DUCT DAMAGED, SEE CP 30402545 FOR R/R OF DUCT. PERFORMED LEAK CHECK OF LH PACK SYSTEM IN REFERENCE TO AMM 21-53-00, LEAK CHECK GOOD AT THIS TIME. "