Several good posts here both regarding the filters and also the paper.
If the machine didn't code, then it was very likely not really out of spec. If it was and went much higher, the thermo-fuses would have popped off.
Living in the nice humid midwest, running paper that has absorbed a lot of moisture can cause some pretty strong odors and since we have now added moisture to the equation, a customer sticking their hand near the upper door will feel the heat more readily from the moisture burning off. (IE, steam). I have seen paper so bad at times that after running a bunch through a machine, you can open the door and the guide above the fuser will be drenched in water.
Something else to check beyond verifying if the fans are running or not is to feel for air flow. Fans can be running, but as Silm mentioned, if ducts are missing/not installed correctly, you may not be getting very good airflow.
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