As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
PILOT REPORTED AFTER TAKEOFF, NR PACK OVERHEAT EICAS MESSAGE, ACCOMPANIED WITH BURNING ODOR. MX INSPECTED AND FOUND A LOOSE CLAMP ON THE NR 2 DUAL TEMP CONTROL VALVE. RAN NR 2 PACK WITH NO FAULTS NOTED. OPS CHECKED GOOD. ACFT WAS APPROVED FOR RETURN TO SERVICE.