Teledyne FALCON GC Operation And Maintenance Manual page 44

Maintenance & Troubleshooting
iv. Check Tubing when Removing GC Case
Note: If the case does not easily slide free, push down lightly on
these tubes to ensure they are below the gap in the case.
Do not try and force the case off. If everything is correctly
removed the case should slide off easily.
34 Teledyne Analytical Instruments
Falcon GC