What was found
EMERGENCY LANDING, ON DESCENT DIRTY SOCK/SMOKE ODOR IN FLIGHT DECK & FWD CABIN. FIRE DEPT MET ACFT. NO DANGER PRESENT. ODOR WAS MORE CHEMICAL IN NATURE. ACFT FERRIED FOR T/S. ODOR ISOLATED TO NR 1 ENG. MX BORESCOPED & INSPECTED NR 1 ENG. NO DEFECTS FOUND. MX FOUND SOOT AT 2.5 BLEED VALVE, ON NR 1 ENG WITH NO FRESH OIL FOUND. VALVE CLEANED, NR 1 ENG RAN AT HIGH PWR & OTHER SETTINGS 30 MINS. NO EVIDENCE OF ODOR. 05MAR06, LEVEL OFF AT FL 290 W/AUTOPILOT & AUTO THRUST ON, AN -ENG 1 STALL- MSG WITH AN AUDIBLE BANG. MX LUBED 2.5 BLEED VALVE, BORESCOPED & PERFORMED PWR ASSURANCE TESTS ON NR 1 ENGINE. NO FAULTS FOUND. MX SUSPECTS LUBE OF 2.5 BLEED VALVE ON 05MAR06 CAUSE OF SOOT & ODOR.