As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) CREW REPORTED THE NR 1 BLEED HOT C/L WAS CYCLING IN-FLIGHT. NR 1 ENGINE BLEED WAS DEACTIVATED AND A/C CONTINUED TO BASE. MAINT INVESTIGATION REVEALED 31 ENGINE BLEED WAS HOGGING THE BLEED LOAD. NR 1 PRESSURE REGULATOR SHUT-OFF VALVE REPLACED.