As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING TAXI CABIN AUTO INOP EICAS MSG DISPLAYED AND A/C RETURNED TO GATE AND MTX GROUNDED A/C MTX PERFORMED RESET OF THE CABIN PRESSURE 1 AND CABIN PRESSURE 2 CONTROLLERS IAW B767 FIM 21-31 FAULT TREE #803 . FAULTS CLEARED AND DID NOT RETURN. A/C REMAINS NO ETOPS. MTX RETURED A/C TO SERVICE.