As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) WHEN FLIGHT WAS ENROUTE, ACFT EXPERIENCED A NR 1 BLEED FAILURE FOLLOWED BY NR 1 BLEED LEAK MESSAGE. WITH THUNDERSHOWERS FORECAST, THE CREW ELECTED TO RETURN. NR 1 ENGINE PRECOOLER AFT INTERFACE GASKET REPLACED IAW AMM 36-11-08 PB401.