The PSL lab flow bench fluro lights have died. Its not obvious how we get to the tubes as the difuser pannel is designed to not be taken out. They may need to be accessed from above or from front. I will call the company today and see how this is done.
Update (Tue Jan 3 16:14:14 2017): called Pure Aire, the lights are replaced from the top. All the stuff stacked on top will need to be removed and four screws removed to open the top pannel.