As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ON FLIGHT 3207 THE CREW REPORTED THAT IMMMEDIATELY UPON SELECTING ON AIR CONDITIONING A SQUEAL SOUND WAS HEARD FOLLOWED BY AN ELECTRICAL SMOKE SMELL FROM THE NR 2 PACK. THE AIRCRAFT WAS REMOVED FROM SERVICE. REMOVED AND REPLACED RIGHT HAND AIR CYCLE MACHINE AND CORECTED ALL DUCT LEAKS IAW EMB-145 AMM 21-51-03. ALL OPS CHECKS AND LEAK CHECKS WERE GOOD. THE AIRCRAFT WAS RETURNED TO SERVICE.