As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
WE TOOK OFF ON A FLIGHT TO A SENDING FACILITY TO PICK UP A PATIENT. DURING CLIMB OUT, THE 'BUS TIE' CIRCUIT BREAKER TRIPPED, ALONG WITH ASSOCIATED WARNINGS AND INDICATIONS. I CONSULTED THE APPROPRIATE SECTION OF THE QRH AND ATTEMPTED TO RESET THE BUS TIE CIRCUIT BREAKER PER QRH GUIDANCE. THE RESET WAS NOT SUCCESSFUL AS THE SAID CIRCUIT BREAKER TRIPPED AGAIN. I THEN MADE THE DECISION TO ABORT THE FLIGHT AND WE RETURNED TO BASE WITHOUT FURTHER INCIDENT.