As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ASH 6373 PHX TO YUM - THE CREW RETURNED TO THE GATE FOR NO OIL PRESSURE ON START UP OF THE NR 1 ENGINE. MAINTENANCE FOUND CURCUIT BREAKER POPPED. RESET THE CIRCUIT BREAKER AND PERFORMED AN ENGINE START. OPS CHECKED GOOD AND NO FURTHER DEFECTS WERE NOTED.