As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
NR 1 ENGINE 5TH STAGE CHECK VALVE FAILED INSPECTION IAW T/C NG-36EO-22817-1. GROUNDED - YES. REMOVED THE NR 1 ENG BLEED AIR CHECK VALVE IAW AMM 36-11-02-00 AND INSTALLED NEW 5TH STAGE BLEED AIR CHECK VALVE IAW AMM 36-11-02-400-801. REINSTALLED NR 1 ENG BLEED AIR CHECK VALVE IAW AMM 36-11-02-400-801, NO LEAKS NOTED. COMPLIED WITH T/C # NG-36EO-22817-1.