As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
THE CREW REPORTED THAT WHILE TAXIING THE AIRCRAFT THE POWER BRAKE CIRCUIT BREAKER TRIPPED. FUNCTIONAL CHECKS FOUND NO DISCREPANCIES WITH THE BRAKE SYSTEM. DURING ANOTHER TRIP FOLLOWING THIS EVENT, THE CREW REPORTED AGAIN THAT THE POWER BRAKE CIRCUIT BREAKER TRIPPED, AND WOULD NOT RESET. FURTHER TROUBLESHOOTING DETERMINED THAT THE CIRCUIT BREAKER WAS DEFECTIVE AND WAS REPLACED WITH NEW. P/N S2899L15.0