As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
L/H ENG BLEED AIR CROSSOVER CHECK FAILS AT POWER SETTINGS BELOW 50% N1. PRESSURES BELOW LIMITS, THROTTLES ADVANCED AND RETARDED. GROUNDED - YES. REMOVED AND REPLACED #1 ENG HIGH STAGE VALVE, REF B737-900 AMM 36-11-06, REQUIRES INSTALLATION TEST. LEAK CHECKED GOOD PER AMM 36-11-06. ACCOMPLISHED ENGINE BLEED AIR CROSSOVER OPERATIONAL TEST PER AMM 36-11-00-710-801. TEST GOOD, NO DEFECTS.