As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ON FLIGHT 3007 THE CREW REPORTED THAT WHEN SELECTING PACK NR 2, PACK NR 2 DID NOT COME ON AND THERE WAS A SLIGHT BURNING SMELL. DEFERRED NR 2 PAC (AIR CONDITIONING) SYSTEM PER MEL 21-29. REMOVED AND REPLACED THE RIGHT AIR CYCLE MACHINE IAW EMB 140 AMM 21-51-03. THE OPERATIONAL CHECK WAS IAW EMB 140 AMM 21-51-00. NO SMELL NOTICED. MEL CLOSED. THE AIRCRAFT WAS RETURNED TO SERVICE.