As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
WHILE EN ROUTE OF FLIGHT 8124 THE PILOT REPORTED A STRONG ELECTRICAL SMELL IN THE COCKPIT. THE PILOT DID A AIR TURN BACK TO SJU. THE AIRCRAFT LANDED WITHOUT INCIDENT. AFTER TROUBLESHOOTING THE MECHANIC FOUND THE AVIONICS COOLING FAN WOULD NOT ROTATE. THE FAN WAS REPLACED, THE SYSTEM CHECKED GOOD AND THE AIRCRAFT WAS RETURNED TO SERVICE.