As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ON FLIGHT 4481 THE CREW REPORTED, SMELLED OIL WITH NR 1 PACK ON. TURNED OFF PACK & SMELL WENT AWAY. DEFERRED PER MEL 21- 29. AUTH # 030976D-C. THE AIRCRAFT WAS REMOVED FROM SERVICE. USING APU BLEED AIR PERFORMED OPERATIONAL CHECK OF NR 1 PACK IAW AMM 21-51-00 & ETN EM-72-034 NO OIL SMELL NOTED. MEL ITEM RESTORED. THE AIRCRAFT WAS RETURNED TO SERVICE.