As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ACFT WAS IN FOR A SERVICE ROUTINE AND ON THE MORNING DEPARTURE CLIMBOUT THE CREW GOT A AURA WARNING OF A FIRE. ACFT RETURNED TO DEPARTURE WHERE MX FOUND THE NR1 ENG FIRE SWITCH WOULD NOT LOCK DOWN INT DOWN POSITION. MX R & R THE ENG FIRE SWITCH IAW MM 31-00-00. OPS CHECK GOOD AND WAS RELEASED TO SERVICE.