Update.
I contacted Mitsubishi and they quoted €268 +VAT for this part.
MfFTO wrote
I have heard of a few centre sections going recently
Steelroe and Brian in Mitsubishi Specialists NI said much the same thing, seems to be a weak link. After much searching I finally found what I was looking for in Mitsubishi Specialists.
I contacted a total of 15 breakers/ suppliers, and a funny (frustrating) pattern emerged. When I asked "Do you have any Mitsubishi FTO's in stock" I got the exact same response from three breakers "What the feck is an FTO". As it happens they were all in the Limerick/Clare area, so maybe it's a localised phenomenon
Perhaps Myfeckin FTO with his local knowledge could advise
Mustang