Preventive Maintenance Checklist 1. Lubricate and clean motor. 2. Clean case. 3. Inspect power cords and plugs. 4. Inspect controls and switches. 5. Insure appropriate menu settings for proper use. 6. Insure tightness of rotor. 7. Check lights and indicators. 8. Verify that alarms are operating properly. 9. Insure interlock is functioning. 10. If refrigerated, insure temperature reading is working. 11. Replace/repair gaskets, seals, and vacuum pump (if applicable).