What was found
AIRCRAFT WAS GROUNDED: LEFT DUCT 20 PSI LOWER IN DESCENT THAN RIGHT DUCT ACCOMPANY BY A STRONG SWEET ODOR DURING DESCENT. ACCOMPLISHED LEFT HAND ENG BLEED HEALTH CHECK, PER WORKCARD 08L40036001, REMOVED AND REPLACED LEFT HAND ENGINE HIGH STAGE VALVE REGULATOR (AALA202502195695), PER AMM 36-11-07. ALSO REPLACED HIGH STAGE VALVE (AALA202502193412), PER AMM 36-11-06. OPERTIONAL CHECKS AND LEAK CHECKS GOOD AT THIS TIME. ACCOMPLISHED ENGINE RUNS, PER AMM 71-00-00 TO ISOLATE ODOR SOURCE AND FOUND NO ODOR AT THIS TIME. SEE TSI 0108999.