Mircom 100 & Edwards Tub

Hi all

I recently had a fire inspector inspect my property and they told me that because my CPU was located inside an Edwards Tub I have to replace my whole fire panel system. They did not elaborate on this and I have been searching to try and find out what an Edwards Tub actually is and if a full replacement is really necessary.

Do any of you guys know about Edwards Tubs? Is there an alternate solution to full replacement of a fire panel in a situation like this?

I am guessing from the information provided to me that the CPU does not have sufficient protection inside the edwards tub but I am confused as to why there would not be a simpler method to protect the CPU without a full replacement.

Any pointers on what this is would be really appreciated as full replacement appears to be very expensive.