Leica CM1850 Cryostat – Error E027. Lab Equipment Repair October 31, 2019 admin Blog, videos Leica is no longer servicing the CM 1850, but we are! Learn more here. Related Posts What to do when your cryostat chuck is not advancing. More useful histology equipment repair tips! The case of the locked microtome! How to repair a sticky cassette clamp. Helpful histology equipment repair insights.