What was found
ODOR OF DECOMPOSING VARMIT IN COCKPIT. FOUND MUFFLER DUCT DISCONNECTED FROM LT RECIRC FAN. SECURED MUFFLER DUCT IAW AMM 21-24-01. RAN BOTH ENGS AT IDLE, MAX POWER, & 75 TLA. INSPECTED IAW ETN-EM-72-034. ODOR INTERMITTENT AT HIGH POWER & NON-EXISTENT AT IDLE. COULDN`T DETERMINE LOCATION OR CAUSE OF ODOR. ODOR ALSO DETECTED AT ENG. SHUTDOWN. PERFORMED GVI OF EICAS DISPLAY, PFD'S, AND MFD'S & SMELLED DISPLAY AREA. COULDN`T LOCATE SOURCE OF ODOR. PERFORMED GVI OF FWD LOWER E/E BAY. NO DEFECTS NOTED. COULDN`T LOCATE SOURCE OF ODOR. PERFORMED NR 1 & 2 ENGINE IDLE RUNS. PERFORMED OPS CHECK IAW ETN-EM-72-034. OPS CHECKED GOOD. PERFORMED TROUBLESHOOTING IAW FIM 21-20-00-810-801-A, AMM 25-12-07, & AMM 36-00-00.