As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AFTER TAKEOFF, WHEN THE RT AIR CONDITIONING PACK WAS TURNED ON, THE RT ENVIRONMENTAL CONTROL CIRCUIT BREAKER AND THE RT ACM CONTROL CIRCUIT BREAKER OPENED AND WOULD NOT RESET. THE CREW RETURNED TO DEPARTURE AND LANDED WITHOUT INCIDENT. MX TROUBLESHOT THE SYS AND REPLACED THE RT FLOW CONTROL VALVE ASSY, IAW MM 21.04. THE OPS CHECK WAS GOOD AND THE ACFT WAS RETURNED TO SERVICE.