What was found
W/O 1860663 DUE T/C NG-36WC-00001 ISSUED REF L/P 60041478 CONTINUATION TROUBLE SHOOTING FOR LEFT BLEED AIR DUCT PRESSURE LOW. GROUNDED-YES. W/O 1860663 T/C NG-36WC-00001 COMPLETED, LEFT BLEED AIR DUCT PRESSURE STILL LOW. PER TECH SERVICE INSPECTED 5TH STAGE VALVE, INSP PASSED, REF 36-11-02-200-801. PER TECH SVC R & R HIGH STAGE VALVE, REF B737-800 AMM 36-11-06, NO HELP, LEFT BLEED AIR DUCT PRESSURE LOW AT IDLE RUN. INSPECTED PRECOOLER INLET, FOUND NO DEBRIS. PER TECH SERVICES R & R PRE-COOLER VALVE SENSOR NO LEAKS, PER AMM 36-72-03. STARTED MIG 2C #40-0028961 FOR PARTIAL WORK MIG 2C 40-0028961 COMPLETED. PRESSURE TRANSDUCER P/N ON/OFF:41SG265-1, S/N ON:M015124 S/N OFF: J026488. ACCOMPLISHED BLEED AIR CROSSOVER TEST, PER AMM 36-11-00-710-801.