As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
RECIRCULATION FAN FAULT MESSAGE. DEFERRED RECIRCULATION FAN NR 2 IAW MEL 21-22-01-2 CAT C. FC FUNCTION C/W BY PULLING AND COLLARING CBP-2 A5, B11. REMOVED AND REPLACED #2 RECIRCULATION FAN IAW CRJ900 AMM TASK21€“22€“10€“000/400€“801. OPS CHECK GOOD, THIS CLEARS MEL