Some of the guys in work checked with Powermax and they said that it's only NCS if the baffles aren't replaced as long as it isn't having an effect on combustion as they are only there to make the boiler a bit more efficient.
Also, you can sometimes get away with getting some condensate pipe and pushing it down on to the broken baffles at the bottom and then they'll pull out with the condensate, and you can get some really long nose pliers - never work on Powermax myself but the guys that do never seem to remove the sump to remove the old baffles.