Lotem 800 Failed Laser??

Hi All

Anybody out there know how to tell if we have a failed laser on a Lotem 800V

We are experiencing lines on the plates which show up on the print

we have slowed down the drum speed which has helped

In the expose params box when we are exposing a plate it reads
Active Diodes 24 (0-23)
Factor -1

Any help would be much appreciated

Thanks in advance