As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING CLIMB THE EICAS DISPLAY INDICATED A SYS NR 1 BLEED AIR LEAK. THE ACFT RETURNED AND LANDED AT WITHOUT INCIDENT WHERE MX PERFORMED TROUBLESHOOTING, PERFORMING SYS OPS CHECKS, HOWEVER THE CONDITION COULD NOT BE DUPLICATED, NOR DID THE WARNING INDICATION ILLUMINATE AGAIN. THE DISCREPANCY WAS CLEARED AND THE ACFT RETURNED TO SERVICE.