# Manage defects and uncertain history

Lesson 2 of [Manage extinguisher service across sites](https://extinguishers.fyi/academy/manage-extinguisher-service-across-sites.md), 12 minutes.

A service process needs a clear response when equipment or its history is uncertain. CCOHS identifies damaged cylinder or shell threads, pitting corrosion and exposure to fire as conditions requiring removal from service. It advises checking with the supplier or manufacturer when serviceability is u…

The rest of this lesson is for learners enrolled in the course. [See how Manage extinguisher service across sites works](https://extinguishers.fyi/academy/manage-extinguisher-service-across-sites.md).

Also on the [web page](https://extinguishers.fyi/academy/manage-extinguisher-service-across-sites/manage-defects-and-uncertain-history).