As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLIGHT 2306 - EWR - DURING CLIMBING FLIGHT CREW REPORTED THE FOLLOWING MSGS ON EICAS: PACK 2 CLSD AND BLD 2 CLSD. CREW RESET THE SYSTEM BUT FAILED AGAIN AND WHEN TRIED AN ANTI ICE TEST GOT BLD 2 FAIL MSG. CREW PERFORMED AIR RETURN AND LANDED UNEVENTFULLY. MX R&R NR 2 BLEED VALVE PUSH BUTTON SWITCH AND PERFORMED OPS CHECK SUCCESSFULLY. ACFT WAS APPROVED TO RETURN TO SERVICE.