hello, I had the exact same problem on a mpc2003, I had also opened a discussion,
MPC 2003: new toner bottle, but half filled (?) the final conclusion was that: 1) the yellow cartridge is less full than others (apparently for a question of yield), 2) the yellow toner tends to be used more because it is used to create other colors .... apart from the excessive consumption other problems I have not had, the machine is very clean, I personally think that the fact of finding yellow toner in the waste tank does not it helps a lot because the exhaust system (as you can see in the attachment) the yellow pcu is the last in line in the discharge path so basically the waste toner undergoes a minor mixing with the other waste toner and therefore comes more "pure" "in the waste toner bottle, good work.
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