I once had a Canon NP7550 (about a million years ago) that was getting no transfer.
When I removed the back cover, there was the mouse (completely in tact) that had bitten into the high voltage cable for the transfer corona, his teeth still stuck in the wire.
I understand that wire insulation is quite yummy.
I extricated the little varmint by his tooth with a pair of forceps. eeeyuk!
The smart@$$ print shop owner quipped "Hey, I bet that's the first Canon copier with a mouse!"
I came really close to flinging the crispy rodent at him...
