What was found
HYD QTY AT PUSH ON LEFT SYSTEM WAS 11 QTS DROPPED TO 7 QTS BY TIME WE REACHED THE RUNWAY. FA'S REPORTED A FAINT ODOR RTN TO GATE. NOTICED DROP IN PRESSURE AFTER ENGINE WAS STARTED AND RUNNING. FOUND APU TURBINE FAILING, LEAK OIL INTERNALLY. R/R APU PER AMM 49-10. FOUND OIL IN APU BLEED AIR DUCT UP TO CHECK VALVE. INSPECTED DUCTING FROM APU TO LT/RT PACKS WITH ULTRAVIOLET LIGHT NO FURTHER OIL CONTAMINATION FOUND. CLEANED AND REINSTALLED DUCTING FROM APU TO CHECK-VALVE. APU OPS CHECKS LEAK CHECKS GOOD. ON STARTING LT ENGINE LOST LT HYD FLUID. FOUND LT O/B ANTI-SKID CONTROL VALVE LEAKING. R/R LT O/B ANTISKID VALVE PER AMM 32-43 OPS CHECKS LEAK CHECKS GOOD. A/C REQUIRES FULL BURNOUT. C/W CARDS 7100-2619 AND 2170-4139. VALVE, ANTI-SKI OFF 08-3246-9-0055 S/N 02900 (LP5485992)