As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
PDX T1010/01 EN ROUTE PDX-DFW RIGHT HAND BUS FAULT AND POPPING CIRCUIT BREAKERS. RETURNED PDX AND LANDED WITHOUT INCIDENT. REMOVED AND REPLACED AIRCRAFT BUS CONTROL UNIT AND R2-36 RELAY SYSTEM PER MM 24-20-08-4. SYSTEM GROUND CHECKED NORMAL OPERATION.