Which is why I have always done all of my maintenance myself--I don't trust any of them. I know you spent money on the mx plan, but for others, here is how to do this yourself....

The battery filter is about a 30 second change. For the FEH, and I assume the MMH, In the back end on the left side panel (looking forward), you snap open the access door, snap open a cover, and pull out the $30 dollar filter, and slide in a new one, noting the direction of the arrows.
It mostly gets dry dirt, so you might get away with simply blowing off the old one with a can of computer-air or a compressor, and not have to waste the $ each time.