As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DC EMERGENCY BUS CAUTION IN FLIGHT, FOUND CB R11 ON CBP-1 OPEN ON ARRIVAL. CLOSED CB AND FAULT EXTINGUISHED. PERFORMED OPS TEST OF THE DC POWER SUPPLY BUSES IAW AMM 24-61-00-710-801 AND FIM 24-31-00-810-803. OPS TEST GOOD. T/S DC EMER BUS CAUTION PER FIM 24-31-00-810-803 AND AMM 24-61-00-710-801. ONLY ABLE TO DUPLICATE MSG BY PULLING BUS POWER SENSE CB1-R11 WHICH WAS NOTED AS POPPED. BREAKER REMAINED SET DURING FIM T/S AND AMM CHECKS. DC EMER BUS CHECKS GOOD.