As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
PDX - "FIRE SYS FAULT" MESSAGE RECEIVED. PLACED ON MEL 26-00-1. RETURNED TO SERVICE. MEL CLEARED EUG 8/18. REMOVED & REPLACED FIDEX CONTROL UNIT IAW CRJ AMM TASK 26-10-01-000-801 & 26-10-01-400-801. PERFORMED OPS TEST OF THE FIDEEX SYS IAW CRJ AMM 26-10-00-710-801. OPS TEST GOOD. RETURNED TO SERVICE.