fuse

I have a Martin ZR24/7 hazer, it gets used every Sunday. But about a month ago it stopped working and I only got around to fixing it last week. I determined that the thermal fuse, a DM182V thermal fuse, had blown. I got a new one from my local lighting dealer, installed it and it worked great...

I recently lost one of my VLs. The power and data to the unit are fine, but I cannot locate a fuse on the unit. Does the 440 HAVE a fuse? Is it simply buried since it is considered a "non-user serviceable" part? Do I have a larger issue with the unit (like a power supply...)?