First thing is check that the Font etc for the word labour is not set wrongly. If all appears ok try printing a new page with labour on it in a couple of places and see what they are like. I also suggest having a look at the Brother website if these ideas do not resolve the issue click here perhaps an email to them may resolve it. Also try deleting the word and replacing it with something else and see what that looks like. I presume you are printing using Word, there is an option to print with a sort of faded font and am wondering if that is what you have inadvertantly done. If you have another full document and print that and its ok then the printer must be fine and it must be something to do with the font selected for this particular word. My explanations aren't very good tonight, appologies for that.
Wait a minute I think I know what it is. You have Word set to US spelling, on the page it will probably be faded out or underlined in red because labour is spelt labor in the US. If you change it to United Kingdom spelling instead of United States and then run spell check it should print ok. I'm sure thats it.
Ah. I get you now. If you print another page of something else does it print ok or is there a missing bit in the same place as the word labour was. If a bit is missing in the same place then its definately the printer. If not and you've checked the font is no different then I'm at a loss to explain it but hopefully someone else can.