As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
RNP AR NOT AVAILABLE CAME INTO VIEW ON EICAS. MESSAGE EXTINGUISHED WHEN APPROACH WAS DISARMED. RETURNED TO FIELD. REMOVED FROM SERVICE. INTERROGATED CMC, NO FAULTS PRESENT. PERFORMED FIM 34-61-00-810-912-A. NO DEFECTS NOTED. AIRCRAFT IS OKAY FOR CONTINUED SERVICE. RETURNED TO SERVICE.