As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
OKC - ON PUSHBACK FOR FLIGHT 4188. RECEIVED A RECIRC FAN FAULT MESSAGE. RETURNED TO THE GATE. MAINTENANCE PLACED THE LEFT RECIRC FAN ON MEL 21-22-1A. CIRCUIT BREAKER A5 PULLED AND COLLARED, AIRCRAFT RETURNED TO SERVICE. ON 12/10 IN DEN MAINTENANCE REPLACED THE LEFT RECIRC FAN. OPERATIONAL CHECKS GOOD. AIRCRAFT RETURNED TO SERVICE. MEL CLEARED.