As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLT 1710, PAP-FLL, EMERGENCY DECLARED. AT 6000 FT CONSTANT VIBRATION/ HUMMING NOISE FOLLOWED BY BURNING SMELL IN THE COCKPIT VENT EXTRACT FAULT MSG. PERFORMED AMM TASK 24-00-00-810-823A TO IDENTIFY SOURCE OF BURNING SMELL. FOUND EXTRACT FAN TO BE AT FAULT. R & R EXTRACT FAN 18HQ IAW AMM 21-26-51. ALL OPS CHECK NORMAL. NO FAULTS NOTED AND SMELL CLEARED.