Can the insulation inside the stove be replaced? Breckwell p24fs

[Safooma]

I have a problem with my Breckwell P24FS where the convection fan just quits and everything else just keeps on going. I have experimented with different fixes and think the problem is heat related. I put a different convection fan in the unit and it did the same thing. I tried leaving the back off and sticking a box fan back there blowing inside the stove and this seems to work...the fan still quits sometimes, but MUCH less frequently. This got me thinking that the problem must be heat related. I noticed that the insulation inside the stove--on the back of the firebox/fuel hopper--is largely missing. My guess at this point that this may be the caise of the over heating.

My question is--Where do I get this stuff and what is it called? Will I be able to find some 'generic' stuff, or will it need to be purchased breckwell?

Thanks!