As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AT DTW, CREW REPORTED RECIRCULATION FAN NR 1 CIRCUIT BREAKER POPPED AND HAD ELECTRICAL SMELL. MAINTENANCE INSPECTED AND DEFERRED RECIRCULATION FAN NR 1 PER MEL. AIRCRAFT WAS RELEASED FOR SERVICE. REMOVED AND REPLACED THE NR 1 RECIRCULATION FAN. CHECKS WERE PERFORMED AND AIRCRAFT WAS RELEASED FOR SERVICE. ALL WORK WAS ACCOMPLISHED USING THE AIRCRAFT MAINTENANCE MANUALS.