As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FIRE LOOP-B FAULT DISPLAYED ON UPPER ECAM SCREEN, ENG 2. ECAM ENG 2 LOOP-B FAULT SELF CLEARED. PERFORMED FUNCTIONAL TEST ON FDU-2, TESTED OK. PERFORMED VISUAL CHECK ON ALL WIRING LEADING TO FDU-2, CLEANED CANON PLUG INSIDE REVERSER AND INSPECTED/CLEANED INSIDE PANEL 424AR. NO FURTHER REPEATS SINCE THIS ACTION.