Originally Posted by bottomend74
Another thing I forgot to mention is that I recently got a rack mount case for the amp. So it is now partially enclosed- could be a cause of overheat I suppose. But the fan seems to working properly.
Even though the fan is working, it sounds like you are impeding the air flow by not allowing the hot air to dissipate. It is important to leave space around the vents. This is sometime done with a vent in the rack case or a fan that circulates the air and drawing it out inside the rack case.
As was suggested, remove the B2RE from the rack and see if this resolves the issue. Also, if there is dust inside the amp, it can prevent it from cooling. Cleaning out any dust might make a difference. At the very least, inspect the inside of the amp to see how it looks. Manufacturers recommend that amps be cleaned by a tech as part of a regular maintenance program.