Of the code is as you say, C0040, that is the suction fan failure to turn. Fairly common. This fan is the one that is on the right hand side door, behind the second transfer/sync roller assembly. Generally when these fans start to fail, there is little else you can do but replace the fan. They are not serviceable though I suppose you could try, but I doubt you will get anywhere.
Part number 9313 1910 61
Good luck
Part number 9313 1910 61
Good luck