Where's the trap on my Hotpoint aquarius 1200?

I may have lost a gold chain in the washing machine but I am unable to find a trap of any kind. The instruction book doesn't help. The machine is tightly fitted under a work surface and I don't want to pull it out unless there is a good chance of some sort of trap being located at the back. Can anyone help. The machine is also giving off a damp smell which makes me think that maybe other things may be lodged somewhere.