What was found
SHORTLY AFTER TAKEOFF, AIRCRAFT (L BLEED AIR) WARNING ILLUMINATED, AND (R BLEED AIR) WARNING ILLUMINATED APPROX 5 SEC LATER, SMELLED ODOR IN CABIN. REDUCED POWER AND WARNING WENT OUT. AIRCRAFT DIVERTED FOR MAINTENANCE. UNABLE TO DUPLICATE MALFUNCTION ON GROUND RUN, LT MIXING VALVE WAS SUSPECTED, SO REPLACED. PERFORMED GROUND RUN FUNCTIONAL TEST OF BLEED AIR SYSTEM, AND FLIGHT TEST. NO FURTHER BLEED AIR WARNINGS. (K)