As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
EICAS MSG "C HYD PRIM 2" APPEARED DURING TAXI, CB PRIM PUMP 2 POPPED, LOW PRESS ELEC 2 LOW PRESS ILLUMINATED. AC RETURNED TO THE GATE (BTB) AND MTX GROUNDED AC . MTX INSPECTED AC AND DEFERRED C PRIM 2 HYDS IAW MEL ABX-29-11-2. AND RETURNED AC TO SERVICE.