Issue

Unable to remove a module from a port.

Warning

Do not attempt to remove a stuck module by using pliers or otherwise forcing its removal. This can damage the switch as well as the transceiver.

Cause

Latching mechanism does not fully disengage locking tab and prevents removal of the transceiver. This case may be due to the bail (handle) not being rotated the full 90 degrees before removal is attempted or the ports locking tab is bent or distorted, possibly from improper removal of a previous stuck module.

Solution

Source

https://www.cisco.com/c/en/us/support/docs/field-notices/620/fn62856.html