As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
THE RT PACKED TRIPPED AT 6,000 FEET LEAVING EWR AND SMOKE BEGAN TO ENTER THE CABIN. SHORTLY AFTERWARDS THE BLEED TRIPPED. THE AIRCRAFT WAS RETURNED TO EWR WHERE IT LANDED WITHOUT INCIDENT. THE 450 DEGREE THERMO VALVE WAS REMOVED AND REPLACED, AN ENGINE BLEED AIR COMPRESSION TEST WAS PERFORMED IAW MM 21-11-0. THE ENGINES WERE RUN FULL POWER WITN NO PACK OR BLEED TRIP OR SMOKE.