The body is removed from the chassis by splaying it outwards along each side and carefully removing it from the chassis. There are three features per body side that locate the body to chassis. A 21-MTC decoder is mounted correct side up (as shown above). The ESU 11x15mm sugarcube speaker with enclosure is located as shown above. Note that the speaker is under the enclosure. This enables more sound to escape from the model. There are separate solder pads available on the OTM lighting board, or the speaker wires can run directly from the decoder to speaker. Test the decoder and then reinstall the body.